[SelectionDAG] Handle vscale range wrapping in isKnownNeverZero

As pointed out by @preames, ConstantRange can wrap so it's possible
for zero to be in a range without zero being the minimum. This fixes
this by checking contains instead.

Author: lukel97

llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

@@ -5649,7 +5649,7 @@ bool SelectionDAG::isKnownNeverZero(SDValue Op, unsigned Depth) const {
     const APInt &Multiplier = Op.getConstantOperandAPInt(0);
     ConstantRange CR =
         getVScaleRange(&F, Op.getScalarValueSizeInBits()).multiply(Multiplier);
-    if (!CR.getUnsignedMin().isZero())
+    if (!CR.contains(APInt(CR.getBitWidth(), 0)))
       return true;
     break;
   }