[lld] [llvm] [lld][MachO] Add ARM64e pointer authentication linking support (PR #188378)

[Daniel Rodríguez Troitiño via llvm-commits]

================

----------------
drodriguez wrote:

Isn't this missing the check against `CPU_SUBTYPE_ARM64_V8` as well? Shouldn't it be easier to check that all have the subtype `CPU_SUBTYPE_ARM64E` instead?

https://github.com/llvm/llvm-project/pull/188378