[llvm] [MemProf] Add CalleeGUIDs from profile to existing VP metadata (PR #171495)

[Teresa Johnson via llvm-commits]

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@@ -373,38 +373,57 @@ static void addVPMetadata(Module &M, Instruction &I,
   if (!ClMemProfAttachCalleeGuids || CalleeGuids.empty())
     return;
 
+  // Prepare the vector of value data, initializing from any existing
+  // value-profile metadata present on the instruction so that we merge the
+  // new CalleeGuids into the existing entries.
+  SmallVector<InstrProfValueData, 8> VDs;
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teresajohnson wrote:

done

https://github.com/llvm/llvm-project/pull/171495