[libcxx] [llvm] [lld] [libc] [flang] [compiler-rt] [libcxxabi] [clang] [clang-tools-extra] [CSSPGO] Compute and report post-match profile staleness (PR #79090)

[Lei Wang via cfe-commits]

================
@@ -2205,93 +2230,141 @@ void 
SampleProfileMatcher::countMismatchedSamples(const FunctionSamples &FS) {
       countMismatchedSamples(CS.second);
 }
 
-void SampleProfileMatcher::countProfileMismatches(
-    const Function &F, const FunctionSamples &FS,
-    const std::map<LineLocation, StringRef> &IRAnchors,
+void ProfileMatchStats::countMismatchedCallsites(
+    const Function &F, const std::map<LineLocation, StringRef> &IRAnchors,
+    const std::map<LineLocation, std::unordered_set<FunctionId>>
+        &ProfileAnchors,
+    const LocToLocMap &IRToProfileLocationMap) {
+  auto &MismatchedCallsites =
+      
FuncMismatchedCallsites[FunctionSamples::getCanonicalFnName(F.getName())];
+
+  auto MapIRLocToProfileLoc = [&](const LineLocation &IRLoc) {
----------------
wlei-llvm wrote:

Yep, the benefit here is pre-match and post-match using the same 
function`countMismatchedCallsites`, no special process to parsing the matching 
results. For pre-match, we just pass a empty `IRToProfileLocationMap` and no 
changes to `RunStaleProfileMatching`.

https://github.com/llvm/llvm-project/pull/79090
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