[llvm] [PAC][readobj][ELF][AArch64] Move PAuth GOT relocs out of private space (PR #118214)

[Fangrui Song via llvm-commits]

https://github.com/MaskRay approved this pull request.

For llvm-readobj, we prefer `[llvm-readobj]` instead of `[readobj]`.

`[PAC]` and `[ELF]` are probably less valuable tags. I'd remove them if I authored the patch.

https://github.com/llvm/llvm-project/pull/118214