[llvm] [AMDGPU][MC] Instructions not to be supported in GFX940 (PR #109225)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm commented:

Are BUFFER_WBL2 and BUFFER_INVL2 also removed and mishandled? 

https://github.com/llvm/llvm-project/pull/109225