diff --git a/compiler/rustc_borrowck/src/region_infer/values.rs b/compiler/rustc_borrowck/src/region_infer/values.rs
index b1caaa6388186..82b96b3efd542 100644
--- a/compiler/rustc_borrowck/src/region_infer/values.rs
+++ b/compiler/rustc_borrowck/src/region_infer/values.rs
@@ -1,4 +1,3 @@
-use rustc_data_structures::fx::FxHashSet;
 use rustc_data_structures::fx::FxIndexSet;
 use rustc_index::bit_set::SparseBitMatrix;
 use rustc_index::interval::IntervalSet;
@@ -42,7 +41,7 @@ pub(crate) struct LivenessValues {
 
     /// Which regions are live. This is exclusive with the fine-grained tracking in `points`, and
     /// currently only used for validating promoteds (which don't care about more precise tracking).
-    live_regions: Option<FxHashSet<RegionVid>>,
+    live_regions: Option<FxIndexSet<RegionVid>>,
 
     /// For each region: the points where it is live.
     ///
@@ -104,10 +103,6 @@ impl LivenessValues {
         self.points.as_ref().expect("use with_specific_points").rows()
     }
 
-    /// Iterate through each region that has a value in this set.
-    // We are passing query instability implications to the caller.
-    #[rustc_lint_query_instability]
-    #[allow(rustc::potential_query_instability)]
     pub(crate) fn live_regions_unordered(&self) -> impl Iterator<Item = RegionVid> + '_ {
         self.live_regions.as_ref().unwrap().iter().copied()
     }
diff --git a/compiler/rustc_borrowck/src/type_check/mod.rs b/compiler/rustc_borrowck/src/type_check/mod.rs
index cfb46f3ac8a96..ab42f76b48eda 100644
--- a/compiler/rustc_borrowck/src/type_check/mod.rs
+++ b/compiler/rustc_borrowck/src/type_check/mod.rs
@@ -599,7 +599,6 @@ impl<'a, 'b, 'tcx> TypeVerifier<'a, 'b, 'tcx> {
         //
         // add_location doesn't care about ordering so not a problem for the live regions to be
         // unordered.
-        #[allow(rustc::potential_query_instability)]
         for region in liveness_constraints.live_regions_unordered() {
             self.cx
                 .borrowck_context
diff --git a/compiler/rustc_borrowck/src/universal_regions.rs b/compiler/rustc_borrowck/src/universal_regions.rs
index a7bdfa4eae769..5bca9070680be 100644
--- a/compiler/rustc_borrowck/src/universal_regions.rs
+++ b/compiler/rustc_borrowck/src/universal_regions.rs
@@ -15,7 +15,7 @@
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(rustc::untranslatable_diagnostic)]
 
-use rustc_data_structures::fx::FxHashMap;
+use rustc_data_structures::fx::FxIndexMap;
 use rustc_errors::Diagnostic;
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_hir::lang_items::LangItem;
@@ -180,7 +180,7 @@ struct UniversalRegionIndices<'tcx> {
     /// basically equivalent to an `GenericArgs`, except that it also
     /// contains an entry for `ReStatic` -- it might be nice to just
     /// use an args, and then handle `ReStatic` another way.
-    indices: FxHashMap<ty::Region<'tcx>, RegionVid>,
+    indices: FxIndexMap<ty::Region<'tcx>, RegionVid>,
 
     /// The vid assigned to `'static`. Used only for diagnostics.
     pub fr_static: RegionVid,
@@ -327,7 +327,6 @@ impl<'tcx> UniversalRegions<'tcx> {
     /// Gets an iterator over all the early-bound regions that have names.
     /// Iteration order may be unstable, so this should only be used when
     /// iteration order doesn't affect anything
-    #[allow(rustc::potential_query_instability)]
     pub fn named_universal_regions<'s>(
         &'s self,
     ) -> impl Iterator<Item = (ty::Region<'tcx>, ty::RegionVid)> + 's {
diff --git a/compiler/rustc_codegen_llvm/src/back/lto.rs b/compiler/rustc_codegen_llvm/src/back/lto.rs
index 42bd8687042a1..886d8901c0149 100644
--- a/compiler/rustc_codegen_llvm/src/back/lto.rs
+++ b/compiler/rustc_codegen_llvm/src/back/lto.rs
@@ -14,6 +14,7 @@ use rustc_codegen_ssa::traits::*;
 use rustc_codegen_ssa::{looks_like_rust_object_file, ModuleCodegen, ModuleKind};
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::memmap::Mmap;
+use rustc_data_structures::unord::UnordMap;
 use rustc_errors::{DiagCtxt, FatalError};
 use rustc_hir::def_id::LOCAL_CRATE;
 use rustc_middle::bug;
@@ -787,7 +788,7 @@ pub unsafe fn optimize_thin_module(
 #[derive(Debug, Default)]
 pub struct ThinLTOKeysMap {
     // key = llvm name of importing module, value = LLVM cache key
-    keys: FxHashMap<String, String>,
+    keys: UnordMap<String, String>,
 }
 
 impl ThinLTOKeysMap {
@@ -797,8 +798,7 @@ impl ThinLTOKeysMap {
         let mut writer = io::BufWriter::new(file);
         // The entries are loaded back into a hash map in `load_from_file()`, so
         // the order in which we write them to file here does not matter.
-        #[allow(rustc::potential_query_instability)]
-        for (module, key) in &self.keys {
+        for (module, key) in self.keys.items().into_sorted_stable_ord() {
             writeln!(writer, "{module} {key}")?;
         }
         Ok(())
@@ -806,7 +806,7 @@ impl ThinLTOKeysMap {
 
     fn load_from_file(path: &Path) -> io::Result<Self> {
         use std::io::BufRead;
-        let mut keys = FxHashMap::default();
+        let mut keys = UnordMap::default();
         let file = File::open(path)?;
         for line in io::BufReader::new(file).lines() {
             let line = line?;
diff --git a/compiler/rustc_codegen_llvm/src/coverageinfo/mapgen.rs b/compiler/rustc_codegen_llvm/src/coverageinfo/mapgen.rs
index b1ceb1d4dd56d..6116a6fd222b3 100644
--- a/compiler/rustc_codegen_llvm/src/coverageinfo/mapgen.rs
+++ b/compiler/rustc_codegen_llvm/src/coverageinfo/mapgen.rs
@@ -403,7 +403,6 @@ fn codegenned_and_inlined_items(tcx: TyCtxt<'_>) -> DefIdSet {
     let mut result = items.clone();
 
     for cgu in cgus {
-        #[allow(rustc::potential_query_instability)]
         for item in cgu.items().keys() {
             if let mir::mono::MonoItem::Fn(ref instance) = item {
                 let did = instance.def_id();
diff --git a/compiler/rustc_codegen_ssa/src/assert_module_sources.rs b/compiler/rustc_codegen_ssa/src/assert_module_sources.rs
index 3e5a43c6e73a6..344e7dbdf034d 100644
--- a/compiler/rustc_codegen_ssa/src/assert_module_sources.rs
+++ b/compiler/rustc_codegen_ssa/src/assert_module_sources.rs
@@ -25,7 +25,7 @@
 
 use crate::errors;
 use rustc_ast as ast;
-use rustc_data_structures::fx::FxHashMap;
+use rustc_data_structures::unord::UnordMap;
 use rustc_data_structures::unord::UnordSet;
 use rustc_errors::{DiagnosticArgValue, IntoDiagnosticArg};
 use rustc_hir::def_id::LOCAL_CRATE;
@@ -218,8 +218,8 @@ pub enum ComparisonKind {
 }
 
 struct TrackerData {
-    actual_reuse: FxHashMap<String, CguReuse>,
-    expected_reuse: FxHashMap<String, (String, Span, CguReuse, ComparisonKind)>,
+    actual_reuse: UnordMap<String, CguReuse>,
+    expected_reuse: UnordMap<String, (String, Span, CguReuse, ComparisonKind)>,
 }
 
 pub struct CguReuseTracker {
@@ -267,9 +267,7 @@ impl CguReuseTracker {
 
     fn check_expected_reuse(&self, sess: &Session) {
         if let Some(ref data) = self.data {
-            #[allow(rustc::potential_query_instability)]
-            let mut keys = data.expected_reuse.keys().collect::<Vec<_>>();
-            keys.sort_unstable();
+            let keys = data.expected_reuse.keys().into_sorted_stable_ord();
             for cgu_name in keys {
                 let &(ref cgu_user_name, ref error_span, expected_reuse, comparison_kind) =
                     data.expected_reuse.get(cgu_name).unwrap();
diff --git a/compiler/rustc_codegen_ssa/src/back/archive.rs b/compiler/rustc_codegen_ssa/src/back/archive.rs
index 8d7ad24b44698..0dadd047c9a97 100644
--- a/compiler/rustc_codegen_ssa/src/back/archive.rs
+++ b/compiler/rustc_codegen_ssa/src/back/archive.rs
@@ -1,4 +1,4 @@
-use rustc_data_structures::fx::FxHashSet;
+use rustc_data_structures::fx::FxIndexSet;
 use rustc_data_structures::memmap::Mmap;
 use rustc_session::cstore::DllImport;
 use rustc_session::Session;
@@ -41,7 +41,7 @@ pub trait ArchiveBuilderBuilder {
         &'a self,
         rlib: &'a Path,
         outdir: &Path,
-        bundled_lib_file_names: &FxHashSet<Symbol>,
+        bundled_lib_file_names: &FxIndexSet<Symbol>,
     ) -> Result<(), ExtractBundledLibsError<'_>> {
         let archive_map = unsafe {
             Mmap::map(
diff --git a/compiler/rustc_codegen_ssa/src/back/link.rs b/compiler/rustc_codegen_ssa/src/back/link.rs
index b29f71bfb9553..f51053eb309d6 100644
--- a/compiler/rustc_codegen_ssa/src/back/link.rs
+++ b/compiler/rustc_codegen_ssa/src/back/link.rs
@@ -1,7 +1,7 @@
 use rustc_arena::TypedArena;
 use rustc_ast::CRATE_NODE_ID;
-use rustc_data_structures::fx::FxHashSet;
 use rustc_data_structures::fx::FxIndexMap;
+use rustc_data_structures::fx::FxIndexSet;
 use rustc_data_structures::memmap::Mmap;
 use rustc_data_structures::temp_dir::MaybeTempDir;
 use rustc_errors::{DiagCtxt, ErrorGuaranteed};
@@ -534,9 +534,9 @@ fn link_staticlib<'a>(
 
             let native_libs = codegen_results.crate_info.native_libraries[&cnum].iter();
             let relevant = native_libs.clone().filter(|lib| relevant_lib(sess, lib));
-            let relevant_libs: FxHashSet<_> = relevant.filter_map(|lib| lib.filename).collect();
+            let relevant_libs: FxIndexSet<_> = relevant.filter_map(|lib| lib.filename).collect();
 
-            let bundled_libs: FxHashSet<_> = native_libs.filter_map(|lib| lib.filename).collect();
+            let bundled_libs: FxIndexSet<_> = native_libs.filter_map(|lib| lib.filename).collect();
             ab.add_archive(
                 path,
                 Box::new(move |fname: &str| {
@@ -565,7 +565,6 @@ fn link_staticlib<'a>(
                 .unwrap_or_else(|e| sess.dcx().emit_fatal(e));
 
             // We sort the libraries below
-            #[allow(rustc::potential_query_instability)]
             let mut relevant_libs: Vec<Symbol> = relevant_libs.into_iter().collect();
             relevant_libs.sort_unstable();
             for filename in relevant_libs {
@@ -682,13 +681,14 @@ fn link_dwarf_object<'a>(
         }
 
         // Input rlibs contain .o/.dwo files from dependencies.
-        #[allow(rustc::potential_query_instability)]
         let input_rlibs = cg_results
             .crate_info
             .used_crate_source
-            .values()
-            .filter_map(|csource| csource.rlib.as_ref())
-            .map(|(path, _)| path);
+            .items()
+            .filter_map(|(_, csource)| csource.rlib.as_ref())
+            .map(|(path, _)| path)
+            .into_sorted_stable_ord();
+
         for input_rlib in input_rlibs {
             debug!(?input_rlib);
             package.add_input_object(input_rlib)?;
@@ -2456,7 +2456,7 @@ fn add_native_libs_from_crate(
     codegen_results: &CodegenResults,
     tmpdir: &Path,
     search_paths: &SearchPaths,
-    bundled_libs: &FxHashSet<Symbol>,
+    bundled_libs: &FxIndexSet<Symbol>,
     cnum: CrateNum,
     link_static: bool,
     link_dynamic: bool,
@@ -2777,7 +2777,7 @@ fn add_static_crate<'a>(
     codegen_results: &CodegenResults,
     tmpdir: &Path,
     cnum: CrateNum,
-    bundled_lib_file_names: &FxHashSet<Symbol>,
+    bundled_lib_file_names: &FxIndexSet<Symbol>,
 ) {
     let src = &codegen_results.crate_info.used_crate_source[&cnum];
     let cratepath = &src.rlib.as_ref().unwrap().0;
diff --git a/compiler/rustc_codegen_ssa/src/base.rs b/compiler/rustc_codegen_ssa/src/base.rs
index 098ea1b793ccb..5e99ff9a6c0b5 100644
--- a/compiler/rustc_codegen_ssa/src/base.rs
+++ b/compiler/rustc_codegen_ssa/src/base.rs
@@ -16,9 +16,10 @@ use crate::{CachedModuleCodegen, CompiledModule, CrateInfo, MemFlags, ModuleCode
 
 use rustc_ast::expand::allocator::{global_fn_name, AllocatorKind, ALLOCATOR_METHODS};
 use rustc_attr as attr;
-use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_data_structures::fx::{FxHashMap, FxIndexSet};
 use rustc_data_structures::profiling::{get_resident_set_size, print_time_passes_entry};
 use rustc_data_structures::sync::par_map;
+use rustc_data_structures::unord::UnordMap;
 use rustc_hir as hir;
 use rustc_hir::def_id::{DefId, LOCAL_CRATE};
 use rustc_hir::lang_items::LangItem;
@@ -851,6 +852,8 @@ impl CrateInfo {
         // `compiler_builtins` are always placed last to ensure that they're linked correctly.
         used_crates.extend(compiler_builtins);
 
+        let crates = tcx.crates(());
+        let n_crates = crates.len();
         let mut info = CrateInfo {
             target_cpu,
             crate_types,
@@ -862,19 +865,15 @@ impl CrateInfo {
             is_no_builtins: Default::default(),
             native_libraries: Default::default(),
             used_libraries: tcx.native_libraries(LOCAL_CRATE).iter().map(Into::into).collect(),
-            crate_name: Default::default(),
+            crate_name: UnordMap::with_capacity(n_crates),
             used_crates,
-            used_crate_source: Default::default(),
+            used_crate_source: UnordMap::with_capacity(n_crates),
             dependency_formats: tcx.dependency_formats(()).clone(),
             windows_subsystem,
             natvis_debugger_visualizers: Default::default(),
         };
-        let crates = tcx.crates(());
 
-        let n_crates = crates.len();
         info.native_libraries.reserve(n_crates);
-        info.crate_name.reserve(n_crates);
-        info.used_crate_source.reserve(n_crates);
 
         for &cnum in crates.iter() {
             info.native_libraries
@@ -901,7 +900,7 @@ impl CrateInfo {
         // by the compiler, but that's ok because all this stuff is unstable anyway.
         let target = &tcx.sess.target;
         if !are_upstream_rust_objects_already_included(tcx.sess) {
-            let missing_weak_lang_items: FxHashSet<Symbol> = info
+            let missing_weak_lang_items: FxIndexSet<Symbol> = info
                 .used_crates
                 .iter()
                 .flat_map(|&cnum| tcx.missing_lang_items(cnum))
@@ -915,7 +914,6 @@ impl CrateInfo {
 
             // This loop only adds new items to values of the hash map, so the order in which we
             // iterate over the values is not important.
-            #[allow(rustc::potential_query_instability)]
             info.linked_symbols
                 .iter_mut()
                 .filter(|(crate_type, _)| {
diff --git a/compiler/rustc_codegen_ssa/src/lib.rs b/compiler/rustc_codegen_ssa/src/lib.rs
index 1afc597a7ef01..615fa7ac720c7 100644
--- a/compiler/rustc_codegen_ssa/src/lib.rs
+++ b/compiler/rustc_codegen_ssa/src/lib.rs
@@ -24,8 +24,10 @@ extern crate tracing;
 extern crate rustc_middle;
 
 use rustc_ast as ast;
+use rustc_data_structures::fx::FxIndexMap;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::sync::Lrc;
+use rustc_data_structures::unord::UnordMap;
 use rustc_hir::def_id::CrateNum;
 use rustc_middle::dep_graph::WorkProduct;
 use rustc_middle::middle::debugger_visualizer::DebuggerVisualizerFile;
@@ -152,16 +154,16 @@ impl From<&cstore::NativeLib> for NativeLib {
 pub struct CrateInfo {
     pub target_cpu: String,
     pub crate_types: Vec<CrateType>,
-    pub exported_symbols: FxHashMap<CrateType, Vec<String>>,
-    pub linked_symbols: FxHashMap<CrateType, Vec<(String, SymbolExportKind)>>,
+    pub exported_symbols: UnordMap<CrateType, Vec<String>>,
+    pub linked_symbols: FxIndexMap<CrateType, Vec<(String, SymbolExportKind)>>,
     pub local_crate_name: Symbol,
     pub compiler_builtins: Option<CrateNum>,
     pub profiler_runtime: Option<CrateNum>,
     pub is_no_builtins: FxHashSet<CrateNum>,
     pub native_libraries: FxHashMap<CrateNum, Vec<NativeLib>>,
-    pub crate_name: FxHashMap<CrateNum, Symbol>,
+    pub crate_name: UnordMap<CrateNum, Symbol>,
     pub used_libraries: Vec<NativeLib>,
-    pub used_crate_source: FxHashMap<CrateNum, Lrc<CrateSource>>,
+    pub used_crate_source: UnordMap<CrateNum, Lrc<CrateSource>>,
     pub used_crates: Vec<CrateNum>,
     pub dependency_formats: Lrc<Dependencies>,
     pub windows_subsystem: Option<String>,
diff --git a/compiler/rustc_data_structures/src/unord.rs b/compiler/rustc_data_structures/src/unord.rs
index 907c866b3edd6..a99e2062039bf 100644
--- a/compiler/rustc_data_structures/src/unord.rs
+++ b/compiler/rustc_data_structures/src/unord.rs
@@ -524,6 +524,11 @@ impl<K: Eq + Hash, V> UnordMap<K, V> {
         UnordItems(self.inner.into_iter())
     }
 
+    #[inline]
+    pub fn keys(&self) -> UnordItems<&K, impl Iterator<Item = &K>> {
+        UnordItems(self.inner.keys())
+    }
+
     /// Returns the entries of this map in stable sort order (as defined by `ToStableHashKey`).
     ///
     /// The `cache_sort_key` parameter controls if [slice::sort_by_cached_key] or
diff --git a/compiler/rustc_hir_typeck/src/expr.rs b/compiler/rustc_hir_typeck/src/expr.rs
index 292b85eb97f7f..16614e0e3d2ce 100644
--- a/compiler/rustc_hir_typeck/src/expr.rs
+++ b/compiler/rustc_hir_typeck/src/expr.rs
@@ -24,6 +24,7 @@ use crate::{
 use rustc_ast as ast;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::stack::ensure_sufficient_stack;
+use rustc_data_structures::unord::UnordMap;
 use rustc_errors::{
     codes::*, pluralize, struct_span_code_err, AddToDiagnostic, Applicability, Diagnostic,
     DiagnosticBuilder, ErrCode, ErrorGuaranteed, StashKey,
@@ -1716,7 +1717,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             .fields
             .iter_enumerated()
             .map(|(i, field)| (field.ident(tcx).normalize_to_macros_2_0(), (i, field)))
-            .collect::<FxHashMap<_, _>>();
+            .collect::<UnordMap<_, _>>();
 
         let mut seen_fields = FxHashMap::default();
 
@@ -1960,18 +1961,15 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         &self,
         adt_ty: Ty<'tcx>,
         span: Span,
-        remaining_fields: FxHashMap<Ident, (FieldIdx, &ty::FieldDef)>,
+        remaining_fields: UnordMap<Ident, (FieldIdx, &ty::FieldDef)>,
         variant: &'tcx ty::VariantDef,
         ast_fields: &'tcx [hir::ExprField<'tcx>],
         args: GenericArgsRef<'tcx>,
     ) {
         let len = remaining_fields.len();
 
-        #[allow(rustc::potential_query_instability)]
-        let mut displayable_field_names: Vec<&str> =
-            remaining_fields.keys().map(|ident| ident.as_str()).collect();
-        // sorting &str primitives here, sort_unstable is ok
-        displayable_field_names.sort_unstable();
+        let displayable_field_names: Vec<&str> =
+            remaining_fields.items().map(|(ident, _)| ident.as_str()).into_sorted_stable_ord();
 
         let mut truncated_fields_error = String::new();
         let remaining_fields_names = match &displayable_field_names[..] {
diff --git a/compiler/rustc_lint/src/context.rs b/compiler/rustc_lint/src/context.rs
index 1c480ec8f53b1..847b5fbf4c2ec 100644
--- a/compiler/rustc_lint/src/context.rs
+++ b/compiler/rustc_lint/src/context.rs
@@ -18,8 +18,9 @@ use self::TargetLint::*;
 
 use crate::levels::LintLevelsBuilder;
 use crate::passes::{EarlyLintPassObject, LateLintPassObject};
-use rustc_data_structures::fx::FxHashMap;
+use rustc_data_structures::fx::FxIndexMap;
 use rustc_data_structures::sync;
+use rustc_data_structures::unord::UnordMap;
 use rustc_errors::{DecorateLint, DiagnosticBuilder, DiagnosticMessage, MultiSpan};
 use rustc_feature::Features;
 use rustc_hir as hir;
@@ -69,10 +70,10 @@ pub struct LintStore {
     pub late_module_passes: Vec<Box<LateLintPassFactory>>,
 
     /// Lints indexed by name.
-    by_name: FxHashMap<String, TargetLint>,
+    by_name: UnordMap<String, TargetLint>,
 
     /// Map of registered lint groups to what lints they expand to.
-    lint_groups: FxHashMap<&'static str, LintGroup>,
+    lint_groups: FxIndexMap<&'static str, LintGroup>,
 }
 
 impl LintStoreMarker for LintStore {}
@@ -326,9 +327,11 @@ impl LintStore {
 
     /// True if this symbol represents a lint group name.
     pub fn is_lint_group(&self, lint_name: Symbol) -> bool {
-        #[allow(rustc::potential_query_instability)]
-        let lint_groups = self.lint_groups.keys().collect::<Vec<_>>();
-        debug!("is_lint_group(lint_name={:?}, lint_groups={:?})", lint_name, lint_groups);
+        debug!(
+            "is_lint_group(lint_name={:?}, lint_groups={:?})",
+            lint_name,
+            self.lint_groups.keys().collect::<Vec<_>>()
+        );
         let lint_name_str = lint_name.as_str();
         self.lint_groups.contains_key(lint_name_str) || {
             let warnings_name_str = crate::WARNINGS.name_lower();
@@ -372,12 +375,9 @@ impl LintStore {
                     None => {
                         // 1. The tool is currently running, so this lint really doesn't exist.
                         // FIXME: should this handle tools that never register a lint, like rustfmt?
-                        #[allow(rustc::potential_query_instability)]
-                        let lints = self.by_name.keys().collect::<Vec<_>>();
-                        debug!("lints={:?}", lints);
+                        debug!("lints={:?}", self.by_name.keys().into_sorted_stable_ord());
                         let tool_prefix = format!("{tool_name}::");
 
-                        #[allow(rustc::potential_query_instability)]
                         return if self.by_name.keys().any(|lint| lint.starts_with(&tool_prefix)) {
                             self.no_lint_suggestion(&complete_name, tool_name.as_str())
                         } else {
diff --git a/compiler/rustc_middle/src/mir/mono.rs b/compiler/rustc_middle/src/mir/mono.rs
index 6937df7bb1897..4403ebfca5e7d 100644
--- a/compiler/rustc_middle/src/mir/mono.rs
+++ b/compiler/rustc_middle/src/mir/mono.rs
@@ -4,6 +4,7 @@ use rustc_attr::InlineAttr;
 use rustc_data_structures::base_n;
 use rustc_data_structures::fingerprint::Fingerprint;
 use rustc_data_structures::fx::FxHashMap;
+use rustc_data_structures::fx::FxIndexMap;
 use rustc_data_structures::stable_hasher::{Hash128, HashStable, StableHasher};
 use rustc_hir::def_id::{CrateNum, DefId, LOCAL_CRATE};
 use rustc_hir::ItemId;
@@ -241,7 +242,7 @@ pub struct CodegenUnit<'tcx> {
     /// contain something unique to this crate (e.g., a module path)
     /// as well as the crate name and disambiguator.
     name: Symbol,
-    items: FxHashMap<MonoItem<'tcx>, MonoItemData>,
+    items: FxIndexMap<MonoItem<'tcx>, MonoItemData>,
     size_estimate: usize,
     primary: bool,
     /// True if this is CGU is used to hold code coverage information for dead code,
@@ -317,12 +318,12 @@ impl<'tcx> CodegenUnit<'tcx> {
     }
 
     /// The order of these items is non-determinstic.
-    pub fn items(&self) -> &FxHashMap<MonoItem<'tcx>, MonoItemData> {
+    pub fn items(&self) -> &FxIndexMap<MonoItem<'tcx>, MonoItemData> {
         &self.items
     }
 
     /// The order of these items is non-determinstic.
-    pub fn items_mut(&mut self) -> &mut FxHashMap<MonoItem<'tcx>, MonoItemData> {
+    pub fn items_mut(&mut self) -> &mut FxIndexMap<MonoItem<'tcx>, MonoItemData> {
         &mut self.items
     }
 
diff --git a/compiler/rustc_monomorphize/src/partitioning.rs b/compiler/rustc_monomorphize/src/partitioning.rs
index 5cfebcaa5a5f9..8bebc30e4356a 100644
--- a/compiler/rustc_monomorphize/src/partitioning.rs
+++ b/compiler/rustc_monomorphize/src/partitioning.rs
@@ -368,7 +368,7 @@ fn merge_codegen_units<'tcx>(
         // Move the items from `cgu_src` to `cgu_dst`. Some of them may be
         // duplicate inlined items, in which case the destination CGU is
         // unaffected. Recalculate size estimates afterwards.
-        cgu_dst.items_mut().extend(cgu_src.items_mut().drain());
+        cgu_dst.items_mut().extend(cgu_src.items_mut().drain(..));
         cgu_dst.compute_size_estimate();
 
         // Record that `cgu_dst` now contains all the stuff that was in
@@ -407,7 +407,7 @@ fn merge_codegen_units<'tcx>(
         // Move the items from `smallest` to `second_smallest`. Some of them
         // may be duplicate inlined items, in which case the destination CGU is
         // unaffected. Recalculate size estimates afterwards.
-        second_smallest.items_mut().extend(smallest.items_mut().drain());
+        second_smallest.items_mut().extend(smallest.items_mut().drain(..));
         second_smallest.compute_size_estimate();
 
         // Don't update `cgu_contents`, that's only for incremental builds.