[llvm] [MemProf] Add v4 which contains CalleeGuids to CallSiteInfo. (PR #137394)

[Kazu Hirata via llvm-commits]

kazutakahirata wrote:

@snehasish I see that you are not adding fields to various structs in `MemProf.h`.  For now, are you just serializing the same data structure in a new format?

https://github.com/llvm/llvm-project/pull/137394