compiler: compare and hash ExternAbi like its string

Directly map each ExternAbi variant to its string and back again.
This has a few advantages:
- By making the ABIs compare equal to their strings, we can easily
  lexicographically sort them and use that sorted slice at runtime.
- We no longer need a workaround to make sure the hashes remain stable,
  as they already naturally are (by being the hashes of unique strings).
- The compiler can carry around less &str wide pointers

1 files changed, 1 insertions, 2 deletions

diff --git a/compiler/rustc_driver_impl/src/lib.rs b/compiler/rustc_driver_impl/src/lib.rs
index 6efd11a8c3c..2bcc33241df 100644
--- a/compiler/rustc_driver_impl/src/lib.rs
+++ b/compiler/rustc_driver_impl/src/lib.rs
@@ -747,8 +747,7 @@ fn print_crate_info(
                 }
             }
             CallingConventions => {
-                let mut calling_conventions = rustc_abi::all_names();
-                calling_conventions.sort_unstable();
+                let calling_conventions = rustc_abi::all_names();
                 println_info!("{}", calling_conventions.join("\n"));
             }
             RelocationModels