================
@@ -27,6 +27,21 @@ namespace llvm {
   class Function;
 
 #if LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING
+#if LLVM_ENABLE_DEBUGLOC_ORIGIN_TRACKING
+  struct DbgLocOrigin {
+    static constexpr unsigned long MaxDepth = 16;
+    using StackTracesTy =
+        SmallVector<std::pair<int, std::array<void *, MaxDepth>>, 0>;
----------------
SLTozer wrote:

Most of the time we store 0 stacktraces, but when we do store a stacktrace 
there may be any number of them - the `addTrace` function adds a new stacktrace 
to the vector, and is used whenever the DebugLoc is "transferred", so that we 
can track the motion of a missing debug location through the program.

https://github.com/llvm/llvm-project/pull/143592
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