[lld] [llvm] [ld64.lld, llvm-otool] Minimal arm64e.x1 support (PR #222721)

[Felipe de Azevedo Piovezan via llvm-commits]

felipepiovezan wrote:

I think this may have broken building LLDB with the beta, as it introduces an identifier that conflicts with SDK identifiers under certain conditions.

`CPU_SUBTYPE_ARM64E_X1` needs to be `#undef`'ed in `/lldb/include/lldb/Host/SafeMachO.h`



https://github.com/llvm/llvm-project/pull/222721