[lld] [lld] Refactor storage of PAuth ABI core info (PR #141920)

[via llvm-commits]

sivan-shani wrote:

Thanks everyone for the feedback.
To keep things manageable, I’ll address the comments in two commits:
The first will take care of the general suggestions—naming, cleanups, etc.
The second will focus on turning AArch64PauthAbiCoreInfo into a class, with constraints and some helper methods.
I hope that sounds reasonable.

https://github.com/llvm/llvm-project/pull/141920