Move all static constants in dtoa/cached-powers.* to .rodata section

Source/wtf/ThreadingPthreads.cpp

 /*
  * Copyright (C) 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Justin Haygood (jhaygood@reaktix.com)
  * Copyright (C) 2011 Research In Motion Limited. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 96 matching lines @@
 {
     DEFINE_STATIC_LOCAL(Mutex, mutex, ());
     return mutex;
 }
 
 void initializeThreading()
 {
     // This should only be called once.
     ASSERT(!atomicallyInitializedStaticMutex);
 
-    WTF::double_conversion::initialize();
     // StringImpl::empty() does not construct its static string in a threadsafe fashion,
     // so ensure it has been initialized from here.
     StringImpl::empty();
     atomicallyInitializedStaticMutex = new Mutex;
     threadMapMutex();
     ThreadIdentifierData::initializeOnce();
     wtfThreadData();
     s_dtoaP5Mutex = new Mutex;
     initializeDates();
 }
@@ skipping 255 matching lines @@
 
 void ThreadCondition::broadcast()
 {
     int result = pthread_cond_broadcast(&m_condition);
     ASSERT_UNUSED(result, !result);
 }
 
 } // namespace WTF
 
 #endif // USE(PTHREADS)