[llvm] [DAG] isKnownNeverZero - add DemandedElts argument (PR #182679)

[Simon Pilgrim via llvm-commits]

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@@ -6164,14 +6185,30 @@ bool SelectionDAG::isKnownNeverZero(SDValue Op, unsigned Depth) const {
   default:
     break;
 
+  case ISD::BUILD_VECTOR:
+    // Are all operands of a build vector constant powers of two or zero?
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RKSimon wrote:

Incorrect comment?

https://github.com/llvm/llvm-project/pull/182679