Auto merge of #124940 - orlp:mum-hash-perf-run, r=<try>

[DO NOT MERGE] perf: test prototype mum-add-hasher

This PR solely exists to do a perf run of a prototype hash I created to see if it would be a worthwhile replacement for FxHash.

?r `@thomcc`

Author: bors

Cargo.lock

@@ -3447,8 +3447,7 @@ dependencies = [
 [[package]]
 name = "rustc-hash"
 version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
+source = "git+https://github.com/orlp/rustc-hash/?branch=mum-hash-perf-run#576bcaf44a3dd1820b0e28166a0244e1f68e0875"
 
 [[package]]
 name = "rustc-main"

Cargo.toml

@@ -111,3 +111,4 @@ strip = true
 rustc-std-workspace-core = { path = 'library/rustc-std-workspace-core' }
 rustc-std-workspace-alloc = { path = 'library/rustc-std-workspace-alloc' }
 rustc-std-workspace-std = { path = 'library/rustc-std-workspace-std' }
+rustc-hash = { git = "https://github.com/orlp/rustc-hash/", branch = "mum-hash-perf-run" }