Refactor all instances of `typedef y x` to the C++11 `using x = y` syntax.

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 78 matching lines @@
   /// Create a node and append it to the end of the linearized list. The loop
   /// nest depth of the new node may not be valid if it is created after
   /// computeLoopNestDepth.
   CfgNode *makeNode();
   SizeT getNumNodes() const { return Nodes.size(); }
   const NodeList &getNodes() const { return Nodes; }
   /// Swap nodes of Cfg with given list of nodes.
   void swapNodes(NodeList &NewNodes);
   /// @}
 
-  typedef int32_t IdentifierIndexType;
+  using IdentifierIndexType = int32_t;
   /// Adds a name to the list and returns its index, suitable for the
   /// argument to getIdentifierName().  No checking for duplicates is
   /// done.  This is generally used for node names and variable names
   /// to avoid embedding a std::string inside an arena-allocated
   /// object.
   IdentifierIndexType addIdentifierName(const IceString &Name) {
     IdentifierIndexType Index = IdentifierNames.size();
     IdentifierNames.push_back(Name);
     return Index;
   }
@@ skipping 178 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