[clang] [llvm] [AMDGPU] Adding instruction specific features (PR #167809)

[Shilei Tian via llvm-commits]

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

Generally LGTM, assuming those instruction names in the description are changed to lower case to align with other features.

https://github.com/llvm/llvm-project/pull/167809