[llvm] [llvm-profgen] Support COFF binary (PR #83972)

[Tobias Hieta via llvm-commits]

https://github.com/tru commented:

LGTM code wise.

I still think this needs some documentation and release notes. I would like to have a release note saying that it's supported in profgen and some examples on how to use in in the profgen manual page (I realize that it's not there for the ELF/perf case, but I think we can set a good precedent and document how to use this.)

https://github.com/llvm/llvm-project/pull/83972