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

[via llvm-commits]

================
@@ -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 *>;
----------------
WenleiHe wrote:

This type is used elsewhere too (`SampleProfileLoader`). Either use the type alias everywhere or spell out the full type everywhere. Maybe it's better to just spell out the type name to be explicit?  

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