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

[Harrison Hao via llvm-commits]

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@@ -973,11 +973,11 @@ class MIMG_Atomic_nsa_gfx11<mimgopc op, string opcode,
 }
 
 class VIMAGE_Atomic_gfx12<mimgopc op, string opcode, RegisterOperand DataRC,
-                          int num_addrs, string renamed, bit enableDisasm = 0>
-  : VIMAGE_gfx12<op.GFX12, (outs DataRC:$vdst), num_addrs,
+                          int num_addrs, string renamed, bit noRtn = 0, bit enableDisasm = 0>
+  : VIMAGE_gfx12<op.GFX12, !if(noRtn, (outs), (outs DataRC:$vdst)), num_addrs,
                   !if(enableDisasm, "GFX12", "")> {
-  let Constraints = "$vdst = $vdata";
-
+  let Constraints = !if(noRtn,"", "$vdst = $vdata");
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harrisonGPU wrote:

Done.

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