[llvm] [AMDGPU] Add wait states between different MFMAs sharing an accumulator (PR #218363)

[Pankaj Dwivedi via llvm-commits]

PankajDwivedi-25 wrote:

Thanks @arsenm for the review feedback, I have updated the patch please have a look if there is any further change required. 

https://github.com/llvm/llvm-project/pull/218363