Reviewed by Geoff and Adam.

        <rdar://problem/5951532> JSProfiler: Implement Bottom-Up view (19228)
        - This is the plumbing for bottom-up, but does not include calculating
        time, mostly because I'm still undclear about what the end result should
        look like.
        - This, obviously, does not include the UI to expose this in the
        inspector yet.

        * JavaScriptCore.xcodeproj/project.pbxproj:
        * profiler/CallIdentifier.h:
        (KJS::CallIdentifier::CallIdentifier):
        (WTF::): Added HashTraits for CallIdentifiers to be used by a HashMap.
        * profiler/HeavyProfile.cpp: Added.
        (KJS::HeavyProfile::HeavyProfile):
        (KJS::HeavyProfile::generateHeavyStructure):
        (KJS::HeavyProfile::addNode):
        (KJS::HeavyProfile::mergeProfiles):
        (KJS::HeavyProfile::addAncestorsAsChildren):
        * profiler/HeavyProfile.h: Added.
        (KJS::HeavyProfile::create):
        (KJS::HeavyProfile::heavyProfile):
        (KJS::HeavyProfile::treeProfile):
        * profiler/Profile.cpp: Removed old commented out includes.
        * profiler/Profile.h: The m_head is needed by the HeavyProfile so it
        is now protected as opposed to private.
        * profiler/ProfileNode.cpp:
        (KJS::ProfileNode::ProfileNode): Created a constructor to copy
        ProfileNodes.
        (KJS::ProfileNode::findChild): Added a null check to make HeavyProfile
        children finding easier and avoid a potential crasher.
        * profiler/ProfileNode.h: Mostly moved things around but also added some
        functionality needed by HeavyProfile.
        (KJS::ProfileNode::create):
        (KJS::ProfileNode::functionName):
        (KJS::ProfileNode::url):
        (KJS::ProfileNode::lineNumber):
        (KJS::ProfileNode::head):
        (KJS::ProfileNode::setHead):
        (KJS::ProfileNode::setNextSibling):
        (KJS::ProfileNode::actualTotalTime):
        (KJS::ProfileNode::actualSelfTime):
        * profiler/TreeProfile.cpp: Implemented the ability to get a
        HeavyProfile.
        (KJS::TreeProfile::heavyProfile):
        * profiler/TreeProfile.h:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@35077 268f45cc-cd09-0410-ab3c-d52691b4dbfc