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

[Daniel Rodríguez Troitiño via llvm-commits]

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drodriguez wrote:

If I understand correctly `CPU_SUBTYPE_ARM64E_VERSIONED_PTRAUTH_ABI_MASK` comment, I do not think `cpuSubtype` will be ever that value. And I am not fully sure it will be a naked `CPU_SUBTYPE_ARM64E` either (but not fully sure about that one).

What are you trying to check for here?

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