Subzero: Add branch optimization.

src/IceCfg.h

 //===- subzero/src/IceCfg.h - Control flow graph ----------------*- 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 Cfg class, which represents the control flow
@@ skipping 76 matching lines @@
   void placePhiStores();
   void deletePhis();
   void doAddressOpt();
   void doArgLowering();
   void doNopInsertion();
   void genCode();
   void genFrame();
   void livenessLightweight();
   void liveness(LivenessMode Mode);
   bool validateLiveness() const;
+  void doBranchOpt();
 
   // Manage the CurrentNode field, which is used for validating the
   // Variable::DefNode field during dumping/emitting.
   void setCurrentNode(const CfgNode *Node) { CurrentNode = Node; }
   const CfgNode *getCurrentNode() const { return CurrentNode; }
 
   void emit();
   void dump(const IceString &Message = "");
 
   // Allocate data of type T using the per-Cfg allocator.
@@ skipping 51 matching lines @@
   // avoid spurious validation failures.
   const CfgNode *CurrentNode;
 
   Cfg(const Cfg &) LLVM_DELETED_FUNCTION;
   Cfg &operator=(const Cfg &) LLVM_DELETED_FUNCTION;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICECFG_H