[llvm] [SDAG] (abd? (?ext x), c) -> (zext (abd? x, c)) (PR #176366)

[via llvm-commits]

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@@ -5812,6 +5812,35 @@ SDValue DAGCombiner::visitABD(SDNode *N) {
     }
   }
 
+  APInt YConst;
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DaKnig wrote:

```suggestion
```

https://github.com/llvm/llvm-project/pull/176366