[clang] [clang][driver] Allow unaligned access on ARMv7 and higher by default (PR #82400)

[Paul Kirth via cfe-commits]

ilovepi wrote:

> I would also personally add Armv6 too for consistency, but don't have a strong opinion.

I think we should too, but everyone agrees this is a strict improvement, so I'd prefer to land something now and we can hash out the right thing for ARMv6  as a follow up. Does that sound good to you?

https://github.com/llvm/llvm-project/pull/82400