Reviewed by Geoffrey Garen.

        Make malloc validation useful
        https://bugs.webkit.org/show_bug.cgi?id=57502

        Reland this patch (rolled out in 82905) without
        turning it on by default.

        * JavaScriptCore.exp:
        * JavaScriptCore.vcproj/JavaScriptCore/JavaScriptCore.def:
        * wtf/FastMalloc.cpp:
        (WTF::tryFastMalloc):
        (WTF::fastMalloc):
        (WTF::tryFastCalloc):
        (WTF::fastCalloc):
        (WTF::fastFree):
        (WTF::tryFastRealloc):
        (WTF::fastRealloc):
        (WTF::fastMallocSize):
        (WTF::TCMalloc_PageHeap::isScavengerSuspended):
        (WTF::TCMalloc_PageHeap::scheduleScavenger):
        (WTF::TCMalloc_PageHeap::suspendScavenger):
        (WTF::TCMalloc_PageHeap::signalScavenger):
        (WTF::TCMallocStats::malloc):
        (WTF::TCMallocStats::free):
        (WTF::TCMallocStats::fastCalloc):
        (WTF::TCMallocStats::tryFastCalloc):
        (WTF::TCMallocStats::calloc):
        (WTF::TCMallocStats::fastRealloc):
        (WTF::TCMallocStats::tryFastRealloc):
        (WTF::TCMallocStats::realloc):
        (WTF::TCMallocStats::fastMallocSize):
        * wtf/FastMalloc.h:
        (WTF::Internal::fastMallocValidationHeader):
        (WTF::Internal::fastMallocValidationSuffix):
        (WTF::Internal::fastMallocMatchValidationType):
        (WTF::Internal::setFastMallocMatchValidationType):
        (WTF::fastMallocMatchValidateFree):
        (WTF::fastMallocValidate):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@85700 268f45cc-cd09-0410-ab3c-d52691b4dbfc