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

[Lei Wang via cfe-commits]

================
@@ -433,6 +433,44 @@ using CandidateQueue =
     PriorityQueue<InlineCandidate, std::vector<InlineCandidate>,
                   CandidateComparer>;
 
+// Profile matching statstics.
+class ProfileMatchStats {
----------------
wlei-llvm wrote:

I was thinking that too until I worked with this 
`StringMap<std::set<LineLocation>> FuncMismatchedCallsites;` which introduce a 
lot of actions making me think to put them into a new class. But as you 
suggested below, we can move  `FuncMismatchedCallsites` out of the stats, or 
even we don't need a new class.



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