Change the comment on opt-level = 2 to point to #50867

Author: SimonSapin

src/Cargo.toml

@@ -40,9 +40,8 @@ members = [
   "tools/rls/test_data/workspace_symbol",
 ]
 
-# Curiously, compiletest will segfault if compiled with opt-level=3 on 64-bit
-# MSVC when running the compile-fail test suite when a should-fail test panics.
-# But hey if this is removed and it gets past the bots, sounds good to me.
+# Curiously, libtest will segfault if compiled with opt-level=3
+# with some versions of XCode: https://github.com/rust-lang/rust/issues/50867
 [profile.release]
 opt-level = 2
 [profile.bench]