Use cg_ssa for creating the dylib metadata file

The new api was introduced in rust-lang/rust#91604

src/driver/aot.rs

@@ -4,6 +4,7 @@
 use std::path::PathBuf;
 
 use rustc_ast::{InlineAsmOptions, InlineAsmTemplatePiece};
+use rustc_codegen_ssa::back::metadata::create_compressed_metadata_file;
 use rustc_codegen_ssa::{CodegenResults, CompiledModule, CrateInfo, ModuleKind};
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_metadata::EncodedMetadata;
@@ -278,7 +279,8 @@ pub(crate) fn run_aot(
             let tmp_file =
                 tcx.output_filenames(()).temp_path(OutputType::Metadata, Some(&metadata_cgu_name));
 
-            let obj = crate::metadata::new_metadata_object(tcx, &metadata_cgu_name, &metadata);
+            let symbol_name = rustc_middle::middle::exported_symbols::metadata_symbol_name(tcx);
+            let obj = create_compressed_metadata_file(tcx.sess, &metadata, &symbol_name);
 
             if let Err(err) = std::fs::write(&tmp_file, obj) {
                 tcx.sess.fatal(&format!("error writing metadata object file: {}", err));

src/lib.rs

@@ -61,7 +61,6 @@ mod inline_asm;
 mod intrinsics;
 mod linkage;
 mod main_shim;
-mod metadata;
 mod num;
 mod optimize;
 mod pointer;