Reviewed by Darin.

    Reviewed by Darin.

	- use single-threaded malloc in places where malloc is hot for an
	8% speed improvement on cvs-base

        * ForwardingHeaders/misc/fast_malloc.h: Added.
        * WebCore.pbproj/project.pbxproj:
        * khtml/css/css_base.h:
        * khtml/css/css_ruleimpl.h:
        * khtml/css/css_valueimpl.h:
        * khtml/css/cssstyleselector.h:
        * khtml/misc/arena.cpp:
        (ArenaAllocate):
        (FreeArenaList):
        (ArenaFinish):
        * khtml/misc/main_thread_malloc.cpp: Added.
        * khtml/misc/main_thread_malloc.h: Added.
        * khtml/rendering/render_style.h:
        * khtml/xml/dom2_eventsimpl.h:
        * khtml/xml/dom2_rangeimpl.h:
        * khtml/xml/dom2_traversalimpl.h:
        * khtml/xml/dom2_viewsimpl.h:
        * khtml/xml/dom_docimpl.h:
        * khtml/xml/dom_elementimpl.cpp:
        (NamedAttrMapImpl::NamedAttrMapImpl):
        (NamedAttrMapImpl::clearAttributes):
        (NamedAttrMapImpl::operator=):
        (NamedAttrMapImpl::addAttribute):
        (NamedAttrMapImpl::removeAttribute):
        * khtml/xml/dom_elementimpl.h:
        * khtml/xml/dom_nodeimpl.h:
        * khtml/xml/dom_stringimpl.h:
        * kwq/KWQFontFamily.h:
        * kwq/KWQListImpl.mm:
        * kwq/KWQString.h:
        * kwq/KWQString.mm:
        (ALLOC_CHAR):
        (ALLOC_QCHAR):
        (QString::setBufferFromCFString):
        (allocatePageNode):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@9050 268f45cc-cd09-0410-ab3c-d52691b4dbfc