Reviewed by Maciej.

        http://bugs.webkit.org/show_bug.cgi?id=12997

        Wrap pthread-specific assertion in #if USE(MULTIPLE_THREADS).

        * kjs/collector.cpp:
        (KJS::Collector::markMainThreadOnlyObjects):

WebCore:

        Reviewed by Maciej Stachowiak.
        
        Fixed <rdar://problem/4576242> | http://bugs.webkit.org/show_bug.cgi?id=12586
        PAC file: malloc deadlock sometimes causes a hang @ www.apple.com/pro/profiles/ (12586)
        
        No test because this is very difficult to repro, and the new ASSERTs in 
        JavaScriptCore catch the underlying cause while running normal layout tests.
        
        This is a modified version of r14752 on the branch.
        
        The fix is to use a bit inside each node, instead of a hash table, to track 
        which node subtrees are in the process of being marked. This avoids a call 
        to malloc inside mark().
        
        * bindings/js/kjs_binding.cpp:
        (KJS::domObjects):
        (KJS::domNodesPerDocument):
        * bindings/js/kjs_dom.cpp:
        (KJS::DOMNode::mark):
        * dom/Node.cpp:
        (WebCore::Node::Node):
        * dom/Node.h:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@20019 268f45cc-cd09-0410-ab3c-d52691b4dbfc