[llvm] [PowerPC] enable AtomicExpandImpl::expandAtomicCmpXchg for powerpc (PR #142395)

[Matt Arsenault via llvm-commits]

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@@ -12739,12 +12736,12 @@ Value *PPCTargetLowering::emitStoreConditional(IRBuilderBase &Builder,
   }
 
   if (SZ == 8 || SZ == 16)
-    Val = Builder.CreateZExt(Val, Builder.getIntNTy(32));;
+    Val = Builder.CreateZExt(Val, Builder.getInt32Ty());
+  ;
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arsenm wrote:

```suggestion
```

https://github.com/llvm/llvm-project/pull/142395