[llvm] [MemProf] Handle missing tail call frames (PR #75823)

[Snehasish Kumar via llvm-commits]

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@@ -365,8 +379,7 @@ class CallsiteContextGraph {
 
   /// Save lists of calls with MemProf metadata in each function, for faster
   /// iteration.
-  std::vector<std::pair<FuncTy *, std::vector<CallInfo>>>
-      FuncToCallsWithMetadata;
+  std::map<FuncTy *, std::vector<CallInfo>> FuncToCallsWithMetadata;
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snehasish wrote:

An ordered map indexed by a pointer sounds like recipe for non-deterministic output. Can we use an unordered_map instead if determinism is unaffected or use a different key if ordering is required?

https://github.com/llvm/llvm-project/pull/75823