[llvm] [BOLT] Gadget scanner: analyze functions without CFG information (PR #133461)

[Anatoly Trosinenko via llvm-commits]

atrosinenko wrote:

@maksfb Is it appropriate to add `instrs()` and `hasLabelAt(Offset)` methods to `BinaryFunction`'s interface this way?

https://github.com/llvm/llvm-project/pull/133461