Review by Adam Barth.

        Implement Node map in intrusive way for better speed.
        https://bugs.webkit.org/show_bug.cgi?id=33957

        * bindings/v8/DOMData.h:
        (WebCore::DOMData::removeObjectsFromWrapperMap):
        * bindings/v8/DOMDataStore.cpp:
        (WebCore::DOMDataStore::IntrusiveDOMWrapperMap::get):
        (WebCore::DOMDataStore::IntrusiveDOMWrapperMap::set):
        (WebCore::DOMDataStore::IntrusiveDOMWrapperMap::removeIfPresent):
        (WebCore::DOMDataStore::IntrusiveDOMWrapperMap::contains):
        (WebCore::DOMDataStore::IntrusiveDOMWrapperMap::visit):
        (WebCore::DOMDataStore::IntrusiveDOMWrapperMap::clear):
        (WebCore::DOMDataStore::IntrusiveDOMWrapperMap::allocateTableEntry):
        (WebCore::DOMDataStore::IntrusiveDOMWrapperMap::freeTableEntry):
        * bindings/v8/DOMDataStore.h:
        (WebCore::DOMDataStore::IntrusiveDOMWrapperMap::IntrusiveDOMWrapperMap):
        (WebCore::DOMDataStore::IntrusiveDOMWrapperMap::clearEntry):
        (WebCore::DOMDataStore::IntrusiveDOMWrapperMap::clearEntries):
        (WebCore::DOMDataStore::IntrusiveDOMWrapperMap::visitEntries):
        (WebCore::DOMDataStore::IntrusiveDOMWrapperMap::TableChunk::TableChunk):
        (WebCore::DOMDataStore::domNodeMap):
        * bindings/v8/StaticDOMDataStore.cpp:
        (WebCore::StaticDOMDataStore::StaticDOMDataStore):
        * bindings/v8/StaticDOMDataStore.h:
        * bindings/v8/V8DOMMap.cpp:
        (WebCore::getDOMNodeMap):
        * bindings/v8/V8DOMMap.h:
        (WebCore::AbstractWeakReferenceMap::AbstractWeakReferenceMap):
        (WebCore::AbstractWeakReferenceMap::weakReferenceCallback):
        (WebCore::WeakReferenceMap::WeakReferenceMap):
        (WebCore::WeakReferenceMap::set):
        (WebCore::WeakReferenceMap::visit):
        * bindings/v8/V8DOMWrapper.cpp:
        (WebCore::V8DOMWrapper::convertDocumentToV8Object):
        (WebCore::getWrapper):
        (WebCore::V8DOMWrapper::convertNodeToV8Object):
        (WebCore::V8DOMWrapper::convertNewNodeToV8Object):
        * bindings/v8/V8DOMWrapper.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@53944 268f45cc-cd09-0410-ab3c-d52691b4dbfc