[llvm] [BOLT] Fix debug line emission for functions in multiple compilation units (PR #151230)

[Paschalis Mpeis via llvm-commits]

https://github.com/paschalis-mpeis commented:

Thanks for your patch @grigorypas.

I've only had a quick look, so this isn't a full review.

I've added a few commetns to help reshape this big work, and hopefully get it closer to being merged.

74747d14bad looks like it could be a standalone PR?
A few more comments below.

https://github.com/llvm/llvm-project/pull/151230