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

[Snehasish Kumar via llvm-commits]

snehasish wrote:

> I guess it depends how how much we expect to diverge in future versions.

Yes, I expect divergence with the introduction of new sections for the summary and callstack hashtable. Internal format changes to the meminfoblock might be less intrusive and be better for refactoring and we can revisit at that time. I will let @kazutakahirata decide.

(accidentally edited the previous comment instead of posting a new one)

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