[lld] [lld][MachO] Warn on underaligned arm64 functions (PR #221636)

[Chak-Kuen Lam via llvm-commits]

dukecat0 wrote:

Thanks for your review! I've applied changes according to your comments.
> So the new Apple linker not longer produces the warnings? It silently ignores this situation?

Yes that's true. So I am not sure if this change is necessary tbh.

https://github.com/llvm/llvm-project/pull/221636