[clang] [Driver,AArch64] Remove AArch32-specific -m[no-]unaligned-access (PR #85441)

[Peter Smith via cfe-commits]

https://github.com/smithp35 commented:

If possible I would prefer to keep -m[no-]unaligned-access for AArch64.

The history of this option name derives from Arm's proprietary compiler https://developer.arm.com/documentation/dui0472/m/Compiler-Command-line-Options/--unaligned-access----no-unaligned-access which has been carried forward for the LLVM based Arm Compiler https://developer.arm.com/documentation/101754/0621/armclang-Reference/armclang-Command-line-Options/-munaligned-access---mno-unaligned-access?lang=en

Yes the proprietary compiler can always put this back as a downstream change. However we are trying to introduce more use of upstream clang and it would help migration of these projects if they didn't need to change.

https://github.com/llvm/llvm-project/pull/85441