[clang] [compiler-rt] [llvm] [ASan] Add metadata to renamed instructions so ASan doesn't use the i… (PR #119387)

[Florian Hahn via cfe-commits]

================
@@ -53,3 +53,4 @@ LLVM_FIXED_MD_KIND(MD_DIAssignID, "DIAssignID", 38)
 LLVM_FIXED_MD_KIND(MD_coro_outside_frame, "coro.outside.frame", 39)
 LLVM_FIXED_MD_KIND(MD_mmra, "mmra", 40)
 LLVM_FIXED_MD_KIND(MD_noalias_addrspace, "noalias.addrspace", 41)
+LLVM_FIXED_MD_KIND(MD_unaltered_name, "unaltered.name", 42)
----------------
fhahn wrote:

Not sure if it is worth adding a new metadata kind to work around not using debug info?

If we need new metadata, it should be documented and also needs to be checked by the verifier, but perhaps it would be possible to use https://llvm.org/docs/LangRef.html#annotation-metadata instead?

https://github.com/llvm/llvm-project/pull/119387