[llvm] [AMDGPU] Add FeatureGFX13 and SMEM encoding for gfx13 (PR #177567)

[Matt Arsenault via llvm-commits]

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

hasGFX1250Insts isn't quite the same but the real problem is using these catch-all named checks instead of something more specific 

https://github.com/llvm/llvm-project/pull/177567