2011-02-07 Geoffrey Garen <ggaren@apple.com>

2011-02-07  Geoffrey Garen  <ggaren@apple.com>

        Reviewed by Oliver Hunt.

        Simplified the marked space's mark invariant
        https://bugs.webkit.org/show_bug.cgi?id=53968

        SunSpider reports no change.

        * runtime/MarkedSpace.cpp:
        (JSC::MarkedSpace::allocate): Mark objects when allocating them. This
        means that, at all times other than the mark phase, an object is live
        if and only if it is marked.

        (JSC::MarkedSpace::containsSlowCase): Use the new mark invariant to
        simplify testing whether an object is live.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@77877 268f45cc-cd09-0410-ab3c-d52691b4dbfc