Reviewed by Ken.

    Reviewed by Ken.

	- merged and cleaned up HTMLCollection and HTMLFormCollection speedups from konqueror

	<rdar://problem/3822992> VIP: Program listings pages at directv.com take a really long time to load [HTMLCollection]
	<rdar://problem/3701991> Safari unresponsive loading (www.maxim-ic.com) (HTMLCollection)

	This is also a start on fixing 5 other bugs, but those need additional work to make
	HTMLFormCollection fast.

        * khtml/html/html_documentimpl.h:
        (DOM::HTMLDocumentImpl::collectionInfo):
        * khtml/html/html_formimpl.cpp:
        (DOM::HTMLFormElementImpl::~HTMLFormElementImpl):
        (DOM::HTMLFormElementImpl::isURLAttribute):
        (DOM::HTMLFormElementImpl::registerImgElement):
        (DOM::HTMLFormElementImpl::removeImgElement):
        * khtml/html/html_formimpl.h:
        * khtml/html/html_imageimpl.cpp:
        (HTMLImageElementImpl::HTMLImageElementImpl):
        (HTMLImageElementImpl::~HTMLImageElementImpl):
        * khtml/html/html_imageimpl.h:
        * khtml/html/html_miscimpl.cpp:
        (HTMLCollectionImpl::HTMLCollectionImpl):
        (HTMLCollectionImpl::~HTMLCollectionImpl):
        (HTMLCollectionImpl::updateCollectionInfo):
        (HTMLCollectionImpl::length):
        (HTMLCollectionImpl::item):
        (HTMLCollectionImpl::firstItem):
        (HTMLCollectionImpl::nextItem):
        (HTMLCollectionImpl::namedItem):
        (HTMLCollectionImpl::nextNamedItemInternal):
        (HTMLFormCollectionImpl::getNamedFormItem):
        * khtml/html/html_miscimpl.h:
        (DOM::HTMLCollectionImpl::):
        (DOM::HTMLCollectionImpl::CollectionInfo::CollectionInfo):
        * khtml/html/htmlparser.cpp:
        (KHTMLParser::getElement):
        * khtml/xml/dom_docimpl.cpp:
        (DocumentImpl::DocumentImpl):
        * khtml/xml/dom_docimpl.h:
        (DOM::DocumentImpl::incDOMTreeVersion):
        (DOM::DocumentImpl::domTreeVersion):
        * khtml/xml/dom_nodeimpl.cpp:
        (NodeImpl::attach):
        (NodeImpl::detach):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@8037 268f45cc-cd09-0410-ab3c-d52691b4dbfc