Subzero: Use a setcc sequence for better icmp lowering.

src/IceTargetLoweringX8632.cpp

 //===- subzero/src/IceTargetLoweringX8632.cpp - x86-32 lowering -----------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file implements the TargetLoweringX8632 class, which
@@ skipping 2730 matching lines @@
       Context.insert(LabelFalse);
       _mov_nonkillable(Dest, Zero);
       Context.insert(LabelTrue);
     }
     return;
   }
 
   // cmp b, c
   Operand *Src0RM =
       legalize(Src0, IsSrc1ImmOrReg ? (Legal_Reg | Legal_Mem) : Legal_Reg);
-  InstX8632Label *Label = InstX8632Label::create(Func, this);
   _cmp(Src0RM, Src1);
-  _mov(Dest, One);
-  _br(getIcmp32Mapping(Inst->getCondition()), Label);
-  _mov_nonkillable(Dest, Zero);
-  Context.insert(Label);
+  _setcc(Dest, getIcmp32Mapping(Inst->getCondition()));
 }
 
 void TargetX8632::lowerInsertElement(const InstInsertElement *Inst) {
   Operand *SourceVectNotLegalized = Inst->getSrc(0);
   Operand *ElementToInsertNotLegalized = Inst->getSrc(1);
   ConstantInteger32 *ElementIndex =
       llvm::dyn_cast<ConstantInteger32>(Inst->getSrc(2));
   // Only constant indices are allowed in PNaCl IR.
   assert(ElementIndex);
   unsigned Index = ElementIndex->getValue();
@@ skipping 2120 matching lines @@
   case FT_Asm:
   case FT_Iasm: {
     OstreamLocker L(Ctx);
     emitConstantPool<PoolTypeConverter<float>>(Ctx);
     emitConstantPool<PoolTypeConverter<double>>(Ctx);
   } break;
   }
 }
 
 } // end of namespace Ice