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

[Ellis Hoag via llvm-commits]

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ellishg wrote:

```suggestion
void ARM64e::writeStubHelperEntry(uint8_t *buf8, const Symbol &sym,
                                  uint64_t entryVA) const {
  ARM64::writeStubHelperEntry(buf8, sym, entryVA);
}
```
Same here and also for a few more functions below.

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