- only collect when the heap is full, unless we have lots of extra cost garbage
        
        1.1% SunSpider speedup.
        
        This shouldn't hit memory use much since the extra space in those
        blocks hangs around either way.

        * kjs/collector.cpp:
        (KJS::Collector::heapAllocate):
        (KJS::Collector::collect): Fix logic error that reversed the sense of collect's 
        return value.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@27503 268f45cc-cd09-0410-ab3c-d52691b4dbfc