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

[via llvm-commits]

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@@ -20,12 +20,32 @@ using namespace sampleprof;
 
 #define DEBUG_TYPE "sample-profile-matcher"
 
+static cl::opt<bool> SalvageUnusedProfile(
+    "salvage-unused-profile", cl::Hidden, cl::init(false),
+    cl::desc(
+        "Salvage unused profile by matching new functions on call graph."));
+
+static cl::opt<unsigned> FuncProfileSimilarityThreshold(
+    "func-profile-similarity-threshold", cl::Hidden, cl::init(80),
+    cl::desc("The profile matches the function if their similarity is above "
+             "the given number(percentage)."));
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WenleiHe wrote:

nit: reword the description: `Consider a profile matches a function if the similarity of their callee sequences is above the specified percentile.`   

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