[llvm] [llvm-readobj][AArch64][ELF][PAC] Support ELF AUTH constants (PR #72713)

[Daniil Kovalev via llvm-commits]

kovdan01 wrote:

Thanks @jh7370 and @MaskRay for your feedback and comments. Addressed the issues in 8d7ee46a6bd46bacde19e4524ec7a33705ac3f7f - please consider reviewing the changes

https://github.com/llvm/llvm-project/pull/72713