[llvm-branch-commits] [llvm] [ir] MD_prof is not UB-implying (PR #152420)

[Nikita Popov via llvm-branch-commits]

================
@@ -1678,6 +1680,8 @@ void 
Instruction::dropUnknownNonDebugMetadata(ArrayRef<unsigned> KnownIDs) {
 
   // A DIAssignID attachment is debug metadata, don't drop it.
   KnownSet.insert(LLVMContext::MD_DIAssignID);
+  if (!ProfcheckDisableMetadataFixes)
+    KnownSet.insert(LLVMContext::MD_prof);
----------------
nikic wrote:

I don't think that inserting it here is correct. This should be handled in the 
caller, like dropUBImplyingAttrsAndMetadata.

https://github.com/llvm/llvm-project/pull/152420
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