[memprof] Don't use Frame::hash or hashCallStacks in unit test (#119984) This patch checks the result of YAML parsing at the level of MemProfRecord instead of IndexedMemProfRecord, thereby avoiding use of Frame::hash and hashCallStacks. This makes sense because we ultimately care about consumers like MemProfiler.cpp obtaining MemProfRecord correctly; IndexedMemProfData and hash values are just intermediaries. Once this patch lands, we call Frame::hash and hashCallStacks only when adding Frames or call stacks to their respective data structures. In other words, the hash functions are pretty much business internal to IndexedMemProfRecord.
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