[llvm] [AArch64][ELF][llvm-readobj] Support the GCS .note.gnu.property bit (PR #75065)

[James Henderson via llvm-commits]

https://github.com/jh7370 approved this pull request.

Looks okay to me, but probably worth @smithp35 confirming he's happy before this gets merged.

https://github.com/llvm/llvm-project/pull/75065