Remove SmallStr.

It no longer has any uses. If it's needed in the future, it can be easily reinstated. Or a crate such as `smallstr` can be used, much like we use `smallvec`.
rust-lang · Jun 29, 2023 · f2d863f · f2d863f
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commit f2d863f
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diff --git a/compiler/rustc_data_structures/src/lib.rs b/compiler/rustc_data_structures/src/lib.rs
@@ -68,7 +68,6 @@ pub mod macros;
 pub mod obligation_forest;
 pub mod sip128;
 pub mod small_c_str;
-pub mod small_str;
 pub mod snapshot_map;
 pub mod svh;
 pub use ena::snapshot_vec;

diff --git a/compiler/rustc_data_structures/src/small_str.rs b/compiler/rustc_data_structures/src/small_str.rs
diff --git a/compiler/rustc_data_structures/src/small_str/tests.rs b/compiler/rustc_data_structures/src/small_str/tests.rs