[llvm] [SampleFDO] Stale profile call-graph matching (PR #92151)

[Lei Wang via llvm-commits]

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@@ -21,6 +21,7 @@ namespace llvm {
 
 using AnchorList = std::vector<std::pair<LineLocation, FunctionId>>;
 using AnchorMap = std::map<LineLocation, FunctionId>;
+using FunctionMap = HashKeyMap<std::unordered_map, FunctionId, Function *>;
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wlei-llvm wrote:

Sounds good to spell out to be explicit. 

https://github.com/llvm/llvm-project/pull/92151