[llvm] [memprof] Refactor getMemProfRecord (NFC) (PR #93138)

[Kazu Hirata via llvm-commits]

================
@@ -649,6 +649,8 @@ class InstrProfReaderRemapper {
 
 class IndexedMemProfReader {
 private:
+  /// The MemProf version.
----------------
kazutakahirata wrote:

Yes, `IndexedMemProfReader::deserialize` initializes `Version` so that `IndexedMemProfReader::getMemProfRecord` can use it in the `switch` statement there.

https://github.com/llvm/llvm-project/pull/93138