[llvm] [AsmPrint] Dump raw frequencies in `-mbb-profile-dump` (PR #66818)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 approved this pull request.

LGTM.

Even in downstream applications like `llvm-cm` it probably makes more sense to do this than using the relative block frequency.

I can push a commit to move the test once this lands. Definitely doesn't make a lot of sense to keep it in `CodeGen/MLRegAlloc` when it's not specific to the register allocator at all.

https://github.com/llvm/llvm-project/pull/66818