[mlir][AMDGPU] Add int4 intrinsics, mixed-type fp8 to handle gfx12#128963

krzysz00 merged 2 commits intollvm:mainllvm/llvm-project:mainfrom

krzysz00:add-i4-wmma-gfx12krzysz00/llvm-project:add-i4-wmma-gfx12Copy head branch name to clipboard