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

[Ellis Hoag via llvm-commits]

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ellishg wrote:

```suggestion
  const AuthInfo *getAuthInfo() const {
    return hasAuth ? &authData.info : nullptr;
  }
```
I think this would simplify code that uses this

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