[clang] [compiler-rt] [lldb] [llvm] Add ARMv8-M and ARMv8.1-M support for Darwin (PR #195184)

[Doug Gregor via cfe-commits]

DougGregor wrote:

> This breaks arm64 macOS bot: https://green.lab.llvm.org/job/llvm.org/job/clang-stage1-RA-as/job/main/1571/

Ah, this is because that bot only enables AArch64, and there's an unnecessary compiler-rt change in my PR. Fix coming shortly.

https://github.com/llvm/llvm-project/pull/195184