Reviewed by Darin.

        <rdar://problem/5770054> JavaScript profiler (10928)
        - Fix "sample" output so that it can be imported into Instruments
        - Also keep track of number of times a function is profiled.

        * JavaScriptCore.xcodeproj/project.pbxproj: Add StrHash.h which needed
        to be pulled out of identifier.cpp so that it could be used by the
        profiler and identifiers.
        * kjs/identifier.cpp: Ditto.
        * profiler/FunctionCallProfile.cpp:
        (KJS::FunctionCallProfile::printDataInspectorStyle): Inspector style
        printing should show microseconds.
        (KJS::FunctionCallProfile::printDataSampleStyle): Sample style printing
        now counts the number of times a function is in the stack tree and does
        not print microseconds since that does not make sense for a sampler.
        * profiler/FunctionCallProfile.h: Keep track of number of times a
        function is profiled.
        (KJS::FunctionCallProfile::numberOfCalls):
        * profiler/Profiler.cpp:
        (KJS::functionNameCountPairComparator): Comparator for sort function in
        printDataSampleStyle.
        (KJS::Profiler::printDataSampleStyle): Print the number of times that a
        function is listed in the stack tree in order of most times listed.
        * wtf/HashCountedSet.h: Added copyToVector since it didn't exist and is
        a more standard way to copy a HashSet to a Vector. I added on variant
        that takes a pair as the Vector's type and so the HashCountedSet simply
        fills in that pair with its internal pair, and another variant that
        takes a Vector of the type of the HashCountedSet and only fills in the
        Vector with the first element of the pair.
        (WTF::copyToVector):
        * wtf/StrHash.h: Added.
        (WTF::):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@32760 268f45cc-cd09-0410-ab3c-d52691b4dbfc