[llvm] [AMDGPU] Add AMDGPU support for llvm-objcopy (PR #92066)

[James Henderson via llvm-commits]

https://github.com/jh7370 commented:

Thank you for the yaml2obj improvements. This PR now looks a lot cleaner. However, I've still yet to see responses to my queries referenced in [this comment](https://github.com/llvm/llvm-project/pull/92066#pullrequestreview-2127359367). Please take a look and respond.

https://github.com/llvm/llvm-project/pull/92066