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

[Daniel Rodríguez Troitiño via llvm-commits]

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drodriguez wrote:

`inline constexpr` to avoid having static copies in each TU (also in the ones below) (or declared here and defined in `ARM64Common.cpp`, but I think they are small arrays and `inline` might be fine)

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