[LegalizeTypes] Use ISD::isTrueWhenEqual to simplify code. NFC

Author: topperc

llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp

@@ -5022,8 +5022,7 @@ void DAGTypeLegalizer::IntegerExpandSetCCOperands(SDValue &NewLHS,
   ConstantSDNode *LoCmpC = dyn_cast<ConstantSDNode>(LoCmp.getNode());
   ConstantSDNode *HiCmpC = dyn_cast<ConstantSDNode>(HiCmp.getNode());
 
-  bool EqAllowed = (CCCode == ISD::SETLE || CCCode == ISD::SETGE ||
-                    CCCode == ISD::SETUGE || CCCode == ISD::SETULE);
+  bool EqAllowed = ISD::isTrueWhenEqual(CCCode);
 
   // FIXME: Is the HiCmpC->isOne() here correct for
   // ZeroOrNegativeOneBooleanContent.