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

src/IceTLS.h

 //===- subzero/src/IceTLS.h - thread_local workaround -----------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 49 matching lines @@
 // The F__initStatus field is used to hold the result of the
 // pthread_key_create() call, where a zero value indicates success,
 // and a nonzero value indicates failure or that ICE_TLS_INIT_FIELD()
 // was never called.
 // The F__key field is used as the argument to
 // pthread_getspecific() and pthread_setspecific().
 
 #include <pthread.h>
 
 #define ICE_TLS_DECLARE_FIELD(Type, FieldName)                                 \
-  typedef Type FieldName##__type;                                              \
+  using FieldName##__type = Type;                                              \
   static pthread_key_t FieldName##__key;                                       \
   static int FieldName##__initStatus
 #define ICE_TLS_DEFINE_FIELD(Type, ClassName, FieldName)                       \
   pthread_key_t ClassName::FieldName##__key;                                   \
   int ClassName::FieldName##__initStatus = 1
 #define ICE_TLS_INIT_FIELD(FieldName)                                          \
   if (FieldName##__initStatus) {                                               \
     FieldName##__initStatus = pthread_key_create(&FieldName##__key, nullptr);  \
     if (FieldName##__initStatus)                                               \
       llvm::report_fatal_error("Failed to create pthread key");                \
@@ skipping 11 matching lines @@
   static ICE_ATTRIBUTE_TLS Type FieldName
 #define ICE_TLS_DEFINE_FIELD(Type, ClassName, FieldName)                       \
   ICE_ATTRIBUTE_TLS Type ClassName::FieldName = nullptr
 #define ICE_TLS_INIT_FIELD(FieldName)
 #define ICE_TLS_GET_FIELD(FieldName) (FieldName)
 #define ICE_TLS_SET_FIELD(FieldName, Value) (FieldName = (Value))
 
 #endif // !ICE_THREAD_LOCAL_HACK
 
 #endif // SUBZERO_SRC_ICETLS_H