[lld] [lld][AArch64][ELF][PAC] Support `.relr.auth.dyn` section (PR #87635)

[Anton Korobeynikov via llvm-commits]

asl wrote:

> Since this patch introduced an issue that lld fail to link the file it generated. Could we revert this change? Other people who uses relocatable linking on aarch64 will likely hit the same issue once they upgrade their lld.

Well, it is great that this issue was found. So, it should be treated as normal bug / missed functionality. Normally per developer policy we do not revert unless it breaks the bot or is known regression wrt some test existing in the mainline.

https://github.com/llvm/llvm-project/pull/87635