[llvm] [MemProf] Add CalleeGUIDs from profile to existing VP metadata (PR #171495)

[Teresa Johnson via llvm-commits]

teresajohnson wrote:

> Do you think it's worth gating this behavior behind a flag in case it causes unexpected decisions for promotion downstream?

I forgot to respond to this comment. I thought about it but it didn't seem necessary since we already have an option to set the minimum count threshold for ICP, and various other flags that can control the amount of metadata used for the summary and for ICP

https://github.com/llvm/llvm-project/pull/171495