[llvm] [AMDGPU] Fix GFX11 WMMA intrinsic lowering regression for compute kernels (PR #164036)

[Carl Ritson via llvm-commits]

perlfu wrote:

Is it worth pre-committing the tests for this?
It seems like the tests are needed regardless of the solution adopted.

https://github.com/llvm/llvm-project/pull/164036