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

[Daniil Kovalev via llvm-commits]

kovdan01 wrote:

@MaskRay 

> Is there a dynamic loader implementation? Without it it's difficult to verify the correctness.

Yes, there is: see https://github.com/access-softek/musl/tree/dkovalev/pauth-code-drop. I've used that to verify the correctness, and it seems that there are no issues (at least no ones were found). Feel free to use this musl implementation and verify the lld patch correctness by yourself independently.

It's possibly worth waiting until I address the review comments and rebase the PR in order to use the latest version of code when testing lld output with musl.

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