Reviewed by Tim.

        <rdar://problem/5770054> JavaScript profiler (10928)
        - Cache some values to save on computing them repetitively. This will be
        a big savings when we sort since we won't have to walk the tree for
        every comparison!
        - We cache these values when we end profiling because otherwise we won't
        know which profile to get the totalTime for the whole profile from without
        retaining a reference to the head profile or looking up the profile from
        the list of all profiles.
        - Also it's safe to assume we won't be asked for these values while we
        are still profiling since the WebInspector only get's profileNodes from
        profiles that are in the allProfiles() list and a profile is only added
        to that list after it has finished and these values will no longer
        change.

        * JavaScriptCore.exp:
        * profiler/ProfileNode.cpp:
        (KJS::ProfileNode::ProfileNode):
        (KJS::ProfileNode::stopProfiling):
        (KJS::ProfileNode::printDataInspectorStyle):
        (KJS::ProfileNode::printDataSampleStyle):
        (KJS::ProfileNode::endAndRecordCall):
        * profiler/ProfileNode.h:
        (KJS::ProfileNode::totalTime):
        (KJS::ProfileNode::selfTime):
        (KJS::ProfileNode::totalPercent):
        (KJS::ProfileNode::selfPercent):
        * profiler/Profiler.cpp:
        (KJS::Profiler::stopProfiling):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@33507 268f45cc-cd09-0410-ab3c-d52691b4dbfc