[memprof] Rename the members of IndexedMemProfData (NFC) (#94873) I'm planning to use IndexedMemProfData in MemProfReader and beyond. Before I do so, this patch renames the members of IndexedMemProfData as MemProfData.FrameData is a bit mouthful with "Data" repeated twice. Note that MemProfReader currently has a trio -- IdToFrame, CSIdToCallStack, and FunctionProfileData. Replacing them with an instance of IndexedMemProfData allows us to use the move semantics from the reader to the writer context. More importantly, treating the profile data as one package makes the maintenance easier. In the past, forgetting to update a place dealing with the trio has resulted in a bug where we totally forgot to emit call stacks into the indexed profile.
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