[llvm] [AMDGPU] Allow intrinsics llvm.amdgcn.buffer.wbinvl1 etc for GFX940+ (PR #111078)

[Matt Arsenault via llvm-commits]

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

This is the opposite of what we should do. The intrinsics should fail to select. Clang should enforce the corresponding builtin is available for the subtarget 

https://github.com/llvm/llvm-project/pull/111078