Reviewed by Simon Hausmann.

        [Qt] Allow custom memory allocation control for the whole JavaScriptCore
        https://bugs.webkit.org/show_bug.cgi?id=27029

        Since in JavaScriptCore almost every class which has been instantiated by operator new is
        inherited from FastAllocBase (bug #20422), we disable customizing global operator new for the Qt-port
        when USE_SYSTEM_MALLOC=0.

        Add #include <unistd.h> to FastMalloc.cpp because it's used by TCMalloc_PageHeap::scavengerThread().
        (It's needed for the functionality of TCmalloc.)

        Add TCSystemAlloc.cpp to JavaScriptCore.pri if USE_SYSTEM_MALLOC is disabled.

        * JavaScriptCore.pri:
        * wtf/FastMalloc.cpp:
        (WTF::sleep):
        * wtf/FastMalloc.h:

2009-10-01  Zoltan Horvath  <zoltan@webkit.org>

        Reviewed by Simon Hausmann.

        [Qt] Don't use TCmalloc in DumpRenderTree
        https://bugs.webkit.org/show_bug.cgi?id=27029

        Add USE_SYSTEM_MALLOC macro to the DRT's profile to avoid using TCmalloc in Qt's DRT.

        * DumpRenderTree/qt/DumpRenderTree.pro:

2009-10-01  Zoltan Horvath  <zoltan@webkit.org>

        Reviewed by Simon Hausmann.

        [Qt] Enable TCmalloc for the Linux, Mac and Windows Qt-port
        https://bugs.webkit.org/show_bug.cgi?id=27029

        Remove USE_SYSTEM_MALLOC for Linux, Mac and Windows Qt-port from WebKit.pri,
        so these Qt-ports will use TCmalloc as other ports.

        * WebKit.pri:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@48976 268f45cc-cd09-0410-ab3c-d52691b4dbfc