[llvm] [MemProf] Attach value profile metadata to the IR using CalleeGuids. (PR #141164)

[Teresa Johnson via llvm-commits]

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@@ -1209,6 +1209,41 @@ readMemprof(Module &M, Function &F, IndexedInstrProfReader *MemProfReader,
                                                InlinedCallStack)) {
           NumOfMemProfMatchedCallSites++;
           addCallsiteMetadata(I, InlinedCallStack, Ctx);
+
+          // Check if this is an indirect call and we have GUID information
+          // from CallSiteInfo to attach value profile metadata
+          if (!CalledFunction) {
+            // This is an indirect call, look for CallSites with matching stacks
+            // that have CalleeGuids information
+            for (auto &CS : MemProfRec->CallSites) {
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teresajohnson wrote:

I don't follow why we're looking through all callsite records again after finding a match with a callsite record? Can we extend LocHashToCallSites and save a pointer to the callsite record there so a second search isn't needed?

https://github.com/llvm/llvm-project/pull/141164