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

[J. Ryan Stinnett via cfe-commits]

================
@@ -22,6 +23,67 @@ namespace llvm {
   class LLVMContext;
   class raw_ostream;
   class DILocation;
+  class Function;
+
+#if ENABLE_DEBUGLOC_COVERAGE_TRACKING
+  // Used to represent different "kinds" of DebugLoc, expressing that a 
DebugLoc
+  // is either ordinary, containing a valid DILocation, or otherwise describing
+  // the reason why the DebugLoc does not contain a valid DILocation.
+  enum class DebugLocKind : uint8_t {
+    // DebugLoc is expected to contain a valid DILocation.
+    Normal,
+    // DebugLoc intentionally does not have a valid DILocation; may be for a
+    // compiler-generated instruction, or an explicitly dropped location.
+    LineZero,
----------------
jryans wrote:

Thanks, this new version looks great to me! 😄 

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