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

[Snehasish Kumar via llvm-commits]

snehasish wrote:

For a set of representative targets this results in a 17% increase in profile size (compared to no calleeguids in v3). If I reduce the number of frames from the leaf to consider when attaching this information, for a limit of 10 frames (inline and non-inline) I see an increase of 14.7%. Note that the overall v4 sizes for each of these profiles was between 1.2M and 18M. So I'm going to leave the encoding as is for now and we can revisit if it significantly impacts profile sizes for specific targets.

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