[llvm] [memprof] Introduce readMemProf (NFC) (PR #88095)

[Snehasish Kumar via llvm-commits]

https://github.com/snehasish commented:

@teresajohnson I suggested this approach. I think it's simpler in the short term as we iterate quickly on new versions. I'm thinking about a case where we have 3-4 different versions which reuse the same logic with multiple conditions. I think it will be hard to reason about, error prone and difficult to remove. Once the format stabilizes we can refactor the implementation to keep the versions we care about. What do you think?

https://github.com/llvm/llvm-project/pull/88095