[llvm] [BOLT][NFC] Add documentation on BOLT options (PR #92117)

[Elvina Yakubova via llvm-commits]

ElvinaYakubova wrote:

@sjoerdmeijer Thanks! For now, I've moved printing options to a separate section, but I'll think about how to improve it further.

https://github.com/llvm/llvm-project/pull/92117