[clang] [llvm] Remove llvm/MC/MCAsmLayout.h and the unused parameter in MCAssembler::layout (PR #97449)

[Davide Italiano via cfe-commits]

dcci wrote:

Thanks for putting this up for review. I appreciate you doing it, for this and future MC patches that could impact BOLT.

https://github.com/llvm/llvm-project/pull/97449