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

[Anatoly Trosinenko via llvm-commits]

atrosinenko wrote:

@maksfb This PR introduces `instrs()` and `hasLabelAt(Offset)` accessors to the interface of `BinaryFunction`. Are these an appropriate way to expose the contents of a `BinaryFunction` without CFG information?

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