[llvm] [AMDGPU] Support image atomic no return instructions (PR #150742)

[Harrison Hao via llvm-commits]

harrisonGPU wrote:

I’ve updated the patch to create new MachineInstrs for image atomics. If the result is unused, it now selects the no-return variant.
Please review it again when you have time, thanks! :-)

https://github.com/llvm/llvm-project/pull/150742