[lld] [lld][AArch64][ELF][PAC] Support AUTH relocations and AUTH ELF marking (PR #72714)

[Daniil Kovalev via llvm-commits]

kovdan01 wrote:

The buildkite is failing as expected since the patch depends on change from #72713 which is not included in this PR. Locally, the build and tests pass. I'll manually re-run buildkite when #72713 is merged.

https://github.com/llvm/llvm-project/pull/72714