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

src/IceConverter.h

 //===- subzero/src/IceConverter.h - Converts LLVM to ICE --------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 30 matching lines @@
   void convertToIce();
 
   llvm::Module *getModule() const { return Mod; }
 
   /// Returns the global declaration associated with the corresponding
   /// global value V. If no such global address, generates fatal error.
   GlobalDeclaration *getGlobalDeclaration(const llvm::GlobalValue *V);
 
 private:
   llvm::Module *Mod;
-  typedef std::map<const llvm::GlobalValue *, GlobalDeclaration *>
-      GlobalDeclarationMapType;
+  using GlobalDeclarationMapType =
+      std::map<const llvm::GlobalValue *, GlobalDeclaration *>;
   GlobalDeclarationMapType GlobalDeclarationMap;
 
   /// Walks module and generates names for unnamed globals using prefix
   /// getFlags().DefaultGlobalPrefix, if the prefix is non-empty.
   void nameUnnamedGlobalVariables(llvm::Module *Mod);
 
   /// Walks module and generates names for unnamed functions using
   /// prefix getFlags().DefaultFunctionPrefix, if the prefix is
   /// non-empty.
   void nameUnnamedFunctions(llvm::Module *Mod);
 
   /// Converts functions to ICE, and then machine code.
   void convertFunctions();
 
   /// Converts globals to ICE, and then machine code.
   void convertGlobals(llvm::Module *Mod);
 
   /// Installs global declarations into GlobalDeclarationMap.
   void installGlobalDeclarations(llvm::Module *Mod);
 };
 
 } // end of namespace ICE.
 
 #endif // SUBZERO_SRC_ICECONVERTER_H