[llvm] [llvm][llvm-readobj] Add NT_ARM_GCS Linux core note type (PR #117545)

[James Henderson via llvm-commits]

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

LGTM. Perhaps worth getting someone else with ARM knowledge a chance to give it a once over (@smithp35?)

https://github.com/llvm/llvm-project/pull/117545