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

[J. Ryan Stinnett via llvm-commits]

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@@ -48,22 +64,29 @@ namespace llvm {
     Temporary
   };
 
-  // Extends TrackingMDNodeRef to also store a DebugLocKind, allowing Debugify
-  // to ignore intentionally-empty DebugLocs.
-  class DILocAndCoverageTracking : public TrackingMDNodeRef {
+  // Extends TrackingMDNodeRef to also store a DebugLocKind and Origin,
+  // allowing Debugify to ignore intentionally-empty DebugLocs and display the
+  // code responsible for generating unintentionally-empty DebugLocs.
+  // Currently we only need to track the Origin of this DILoc when using a
+  // DebugLoc that is Normal and empty, so only collect the origin stacktrace in
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jryans wrote:

Ah okay, re-reading it again, I think it makes sense this time. Not quite sure how to best clarify for other readers... Maybe move some of your "Normal" explanation here into the code comment...?

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