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

[Anatoly Trosinenko via llvm-commits]

https://github.com/atrosinenko commented:

@maksfb Oh, forgot to mention this explicitly: unlike many other PRs from this series, this one exposes a few more pieces of information from `BinaryFunction`, namely the flat list of instructions when CFG is not available and information about whether there are any labels before the particular instruction.

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