Shrink ElementRareData by moving bool flags to NodeRareData.
<http://webkit.org/b/98225>

Reviewed by Antti Koivisto.

Move all bool flags from ElementRareData to the bitfield in its base class NodeRareData.
This shrinks ElementRareData by 8 bytes (on 64-bit) and saves a whopping 58kB on Membuster3.
Also removed some double raredata hash lookups.

* dom/Element.cpp:
(WebCore::Element::detach):
(WebCore::Element::recalcStyle):
(WebCore::Element::ensureShadow):
(WebCore::Element::setStyleAffectedByEmpty):
(WebCore::Element::styleAffectedByEmpty):
(WebCore::Element::setIsInCanvasSubtree):
(WebCore::Element::isInCanvasSubtree):
(WebCore::Element::containsFullScreenElement):
(WebCore::Element::setContainsFullScreenElement):
* dom/ElementRareData.h:
(ElementRareData):
(WebCore::ElementRareData::ElementRareData):
* dom/NodeRareData.h:
(WebCore::NodeRareData::styleAffectedByEmpty):
(WebCore::NodeRareData::setStyleAffectedByEmpty):
(WebCore::NodeRareData::isInCanvasSubtree):
(WebCore::NodeRareData::setIsInCanvasSubtree):
(NodeRareData):
(WebCore::NodeRareData::containsFullScreenElement):
(WebCore::NodeRareData::setContainsFullScreenElement):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@130278 268f45cc-cd09-0410-ab3c-d52691b4dbfc