[X86] Fix a place that was mishandling X86ISD::UMUL.

According to the X86ISelLowering.h, UMUL results are low, high, and flags. But this place was treating result 1 or 2 as flags.

Differential Revision: https://reviews.llvm.org/D36654

llvm-svn: 310846

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -17604,7 +17604,7 @@ static bool isX86LogicalCmp(SDValue Op) {
     return true;
   if (Op.getResNo() == 1 &&
       (Opc == X86ISD::ADD || Opc == X86ISD::SUB || Opc == X86ISD::ADC ||
-       Opc == X86ISD::SBB || Opc == X86ISD::SMUL || Opc == X86ISD::UMUL ||
+       Opc == X86ISD::SBB || Opc == X86ISD::SMUL ||
        Opc == X86ISD::INC || Opc == X86ISD::DEC || Opc == X86ISD::OR ||
        Opc == X86ISD::XOR || Opc == X86ISD::AND))
     return true;