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

[Mirko Brkušanin via llvm-commits]

================
@@ -1091,12 +1092,13 @@ multiclass MIMG_Atomic_Addr_Helper_m <mimgopc op, string asm,
     }
 }
 
-multiclass MIMG_Atomic <mimgopc op, string asm, bit isCmpSwap = 0, bit isFP = 0,
-                        string renamed = ""> { // 64-bit atomics
-  let IsAtomicRet = 1 in {
+multiclass MIMG_Atomic_Impl <mimgopc op, string asm, bit isCmpSwap = 0, bit isFP = 0,
+                        bit noRtn = 0, string renamed = ""> { // 64-bit atomics
+  let IsAtomicRet = !if(noRtn, 0, 1) in {
     def "" : MIMGBaseOpcode {
       let Atomic = 1;
       let AtomicX2 = isCmpSwap;
+      let NoReturn = !if(noRtn, 1, 0);
----------------
mbrkusanin wrote:

```suggestion
      let NoReturn = noRtn;
```

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