Reviewed by Richard.

    Reviewed by Richard.

	- reduce cost of innerHTML from O(N^2) to O(N*D) where N is the
	number of nodes and D is the maximum DOM tree depth.

        * khtml/xml/dom_nodeimpl.cpp:
        (NodeImpl::recursive_toString): New static helper method for
	recursive_toHTML - this is recursive for children but iterative
	for siblings.
        (NodeImpl::recursive_toHTML): Call the helper with this as the
	first argument.
        * khtml/xml/dom_nodeimpl.h:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@7333 268f45cc-cd09-0410-ab3c-d52691b4dbfc