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

src/IceTypes.h

 //===- subzero/src/IceTypes.h - Primitive ICE types -------------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 111 matching lines @@
 inline StreamType &operator<<(StreamType &Str, const Type &Ty) {
   Str << typeString(Ty);
   return Str;
 }
 
 /// Models a type signature for a function.
 class FuncSigType {
   FuncSigType &operator=(const FuncSigType &Ty) = delete;
 
 public:
-  typedef std::vector<Type> ArgListType;
+  using ArgListType = std::vector<Type>;
 
   /// Creates a function signature type with the given return type.
   /// Parameter types should be added using calls to appendArgType.
   FuncSigType() = default;
   FuncSigType(const FuncSigType &Ty) = default;
 
   void appendArgType(Type ArgType) { ArgList.push_back(ArgType); }
 
   Type getReturnType() const { return ReturnType; }
   void setReturnType(Type NewType) { ReturnType = NewType; }
@@ skipping 13 matching lines @@
 };
 
 inline Ostream &operator<<(Ostream &Stream, const FuncSigType &Sig) {
   Sig.dump(Stream);
   return Stream;
 }
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETYPES_H