[clang] [llvm] [DLCov 2/5] Implement DebugLoc coverage tracking (PR #107279)

[J. Ryan Stinnett via llvm-commits]

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@@ -2080,6 +2081,10 @@ void DwarfDebug::beginInstruction(const MachineInstr *MI) {
   }
 
   if (!DL) {
+    // FIXME: We could assert that `DL.getKind() != DebugLocKind::Temporary`
+    // here, or otherwise record any temporary DebugLocs seen to ensure that
+    // transient compiler-generated instructions aren't leaking their DLs to
+    // other instructions.
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jryans wrote:

Hmm yes, reporting such cases somehow does seem valuable... though unclear to me which way is best, so perhaps best left as future work for now.

https://github.com/llvm/llvm-project/pull/107279