Reviewed by Tim Hatcher.

        - https://bugs.webkit.org/show_bug.cgi?id=22061
          create script to check for exit-time destructors

        * JavaScriptCore.exp: Changed to export functions rather than
        a global for the atomically initialized static mutex.

        * JavaScriptCore.xcodeproj/project.pbxproj: Added a script
        phase that runs the check-for-exit-time-destructors script.

        * wtf/MainThread.cpp:
        (WTF::mainThreadFunctionQueueMutex): Changed to leak an object
        rather than using an exit time destructor.
        (WTF::functionQueue): Ditto.
        * wtf/unicode/icu/CollatorICU.cpp:
        (WTF::cachedCollatorMutex): Ditto.

        * wtf/Threading.h: Changed other platforms to share the Windows
        approach where the mutex is internal and the functions are exported.
        * wtf/ThreadingGtk.cpp:
        (WTF::lockAtomicallyInitializedStaticMutex): Ditto.
        (WTF::unlockAtomicallyInitializedStaticMutex): Ditto.
        * wtf/ThreadingNone.cpp:
        (WTF::lockAtomicallyInitializedStaticMutex): Ditto.
        (WTF::unlockAtomicallyInitializedStaticMutex): Ditto.
        * wtf/ThreadingPthreads.cpp:
        (WTF::threadMapMutex): Changed to leak an object rather than using
        an exit time destructor.
        (WTF::lockAtomicallyInitializedStaticMutex): Mutex change.
        (WTF::unlockAtomicallyInitializedStaticMutex): Ditto.
        (WTF::threadMap): Changed to leak an object rather than using
        an exit time destructor.
        * wtf/ThreadingQt.cpp:
        (WTF::lockAtomicallyInitializedStaticMutex): Mutex change.
        (WTF::unlockAtomicallyInitializedStaticMutex): Ditto.
        * wtf/ThreadingWin.cpp:
        (WTF::lockAtomicallyInitializedStaticMutex): Added an assertion.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@38101 268f45cc-cd09-0410-ab3c-d52691b4dbfc