[clang] [Clang][ARM]Ensure both -mno-unaligned-access and -munaligned-access are passed to multilib selection logic (PR #134099)

[Peter Smith via cfe-commits]

https://github.com/smithp35 commented:

I think it would be useful to mention in the Description that -mno-unaligned-access and -mstrict-align are synonyms, and that we pass both through so that the multilib.yaml file can select on either.

https://github.com/llvm/llvm-project/pull/134099