[llvm] [BOLT] Add dump-dot-func option for selective function CFG dumping (PR #153007)

[Sjoerd Meijer via llvm-commits]

https://github.com/sjoerdmeijer approved this pull request.

Thanks, LGTM

Please wait a day or two in case someone else has some more comments before merging this. 

https://github.com/llvm/llvm-project/pull/153007