[llvm] [AMDGPU] Add intrinsic for raw atomic buffer loads (PR #97707)

[Krzysztof Drewniak via llvm-commits]

https://github.com/krzysz00 commented:

Could you go ahead and address the TODO at https://github.com/llvm/llvm-project/blob/main/llvm/lib/Target/AMDGPU/AMDGPULowerBufferFatPointers.cpp#L1095-L1096 ? That's left over from this intrinsic not being upstreamed

https://github.com/llvm/llvm-project/pull/97707