Subzero: Fold icmp into br/select lowering.

src/IceTargetLowering.h

 //===- subzero/src/IceTargetLowering.h - Lowering interface -----*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares the TargetLowering, LoweringContext, and
@@ skipping 203 matching lines @@
 
   virtual void emit(const ConstantUndef *C) const = 0;
   virtual void emit(const ConstantInteger32 *C) const = 0;
   virtual void emit(const ConstantInteger64 *C) const = 0;
   virtual void emit(const ConstantFloat *C) const = 0;
   virtual void emit(const ConstantDouble *C) const = 0;
 
   // Performs target-specific argument lowering.
   virtual void lowerArguments() = 0;
 
+  virtual void initNodeForLowering(CfgNode *) {}
   virtual void addProlog(CfgNode *Node) = 0;
   virtual void addEpilog(CfgNode *Node) = 0;
 
   virtual ~TargetLowering() {}
 
 protected:
   explicit TargetLowering(Cfg *Func);
   virtual void lowerAlloca(const InstAlloca *Inst) = 0;
   virtual void lowerArithmetic(const InstArithmetic *Inst) = 0;
   virtual void lowerAssign(const InstAssign *Inst) = 0;
@@ skipping 89 matching lines @@
   virtual void lowerConstants() const = 0;
 
 protected:
   explicit TargetDataLowering(GlobalContext *Ctx) : Ctx(Ctx) {}
   GlobalContext *Ctx;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERING_H