[clang] [llvm] [DLCov 3/5] Implement DebugLoc origin-tracking (PR #107369)

[J. Ryan Stinnett via llvm-commits]

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@@ -1279,6 +1279,9 @@ void Instruction::swapProfMetadata() {
 
 void Instruction::copyMetadata(const Instruction &SrcInst,
                                ArrayRef<unsigned> WL) {
+  if (WL.empty() || is_contained(WL, LLVMContext::MD_dbg))
+    setDebugLoc(SrcInst.getDebugLoc());
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jryans wrote:

Hmm, I'm wondering why this was necessary and if it may have unrelated consequence beyond this patch stack's feature...?

https://github.com/llvm/llvm-project/pull/107369