[llvm] [AMDGPU] Add an asm directive to track code_object_version (PR #76267)

[Scott Linder via llvm-commits]

https://github.com/slinder1 requested changes to this pull request.

LGTM with some nits, and a broader question about what we call this version across IR, Asm, and in documentation.

https://github.com/llvm/llvm-project/pull/76267