[llvm] [SampleFDO] Stale profile call-graph matching (PR #95135)

[David Li via llvm-commits]

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@@ -189,7 +238,9 @@ LocToLocMap SampleProfileMatcher::longestCommonSequence(
         X = V[Index(K - 1)] + 1;
       Y = X - K;
       while (X < Size1 && Y < Size2 &&
-             AnchorList1[X].second == AnchorList2[Y].second)
+             functionMatchesProfile(AnchorList1[X].second,
+                                    AnchorList2[Y].second,
+                                    !MatchUnusedFunction))
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david-xl wrote:

The negation is slightly confusing. Perhaps add a comment : !MatchUnusedFunction /* matched functions only */

https://github.com/llvm/llvm-project/pull/95135