Reviewed by Oliver Hunt.

        Added OldSpace to the project
        https://bugs.webkit.org/show_bug.cgi?id=62417
        
        Currently unused.
        
        Added OldSpace, the ability to iterate NewSpace vs OldSpace, and a
        per-block flag for testing whether you're in NewSpace vs OldSpace.

        * CMakeLists.txt:
        * GNUmakefile.list.am:
        * JavaScriptCore.gypi:
        * JavaScriptCore.pro:
        * JavaScriptCore.vcproj/JavaScriptCore/JavaScriptCore.vcproj:
        * JavaScriptCore.xcodeproj/project.pbxproj: Build!

        * heap/MarkedBlock.cpp:
        (JSC::MarkedBlock::MarkedBlock):
        * heap/MarkedBlock.h:
        (JSC::MarkedBlock::inNewSpace):
        (JSC::MarkedBlock::setInNewSpace): Added inNewSpace flag, for use in
        write barrier.

        * heap/NewSpace.cpp:
        (JSC::NewSpace::addBlock):
        (JSC::NewSpace::removeBlock):
        * heap/NewSpace.h:
        (JSC::NewSpace::forEachBlock): Added forEachBlock, to use for
        NewSpace-specific operations.

        * heap/OldSpace.cpp: Added.
        (JSC::OldSpace::OldSpace):
        (JSC::OldSpace::addBlock):
        (JSC::OldSpace::removeBlock):
        * heap/OldSpace.h: Added.
        (JSC::OldSpace::forEachBlock): New class for holding promoted blocks.
        Not in use yet.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@88519 268f45cc-cd09-0410-ab3c-d52691b4dbfc