[VPlan] Simplify xor expression

Author: artagnon

llvm/lib/Transforms/Vectorize/VPlanUtils.h

@@ -92,8 +92,8 @@ inline VPIRFlags getFlagsFromIndDesc(const InductionDescriptor &ID) {
     // step differ, as this could sign-wrap over iterations.
     bool HasNSW = OBO->hasNoSignedWrap() && ID.getConstIntStartValue() &&
                   ID.getConstIntStepValue() &&
-                  !(ID.getConstIntStartValue()->isNegative() ^
-                    ID.getConstIntStepValue()->isNegative());
+                  ID.getConstIntStartValue()->isNegative() ==
+                      ID.getConstIntStepValue()->isNegative();
     return VPIRFlags::WrapFlagsTy(OBO->hasNoUnsignedWrap(), HasNSW);
   }