Add -reorder-basic-blocks option and fix nop insertion

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.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 162 matching lines @@
   /// After the CFG is fully constructed, iterate over the nodes and
   /// compute the predecessor and successor edges, in the form of
   /// CfgNode::InEdges[] and CfgNode::OutEdges[].
   void computeInOutEdges();
   void renumberInstructions();
   void placePhiLoads();
   void placePhiStores();
   void deletePhis();
   void advancedPhiLowering();
   void reorderNodes();
+  void shuffleNodes();
   void doAddressOpt();
   void doArgLowering();
   void doNopInsertion();
   void genCode();
   void genFrame();
   void livenessLightweight();
   void liveness(LivenessMode Mode);
   bool validateLiveness() const;
   void contractEmptyNodes();
   void doBranchOpt();
@@ skipping 87 matching lines @@
   /// other uses are possible.
   ICE_TLS_DECLARE_FIELD(const Cfg *, CurrentCfg);
 
 public:
   static void TlsInit() { ICE_TLS_INIT_FIELD(CurrentCfg); }
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICECFG_H