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

[Davide Italiano via cfe-commits]

dcci wrote:

> Just to clarify, these changes are fairly straightforward and shouldn't impact any clients.

You can't really make this assumption. Maybe in this case it was true, but in the other case that I mention (relaxing frames eagerly, your assumption was incorrect and we had to adapt BOLT downstream to deal with the functional changes). This is why asking for review is a good practice regardless.

> Perhaps there's a way to achieve this goal without potentially causing unintended breakage through reverts.

I do believe code reviews are a good way to provide heads-up. Thanks for your work.

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