Reviewed by Darin Adler.

        Add a new define for we need strict arena alignment. ARMv5 with
        double word instructions set this value.

        * wtf/Platform.h:
2010-05-15  Dave Tapuska  <dtapuska@rim.com>

        Reviewed by Darin Adler.

        Fix alignment faults on ARMv5TE architectures.

        In debug mode the RenderAreaDebugHeader was 12 bytes which
        caused an alignment failure for RenderObjects because they
        would start on a 4 byte boundary. Align the RenderArenaDebugHeader
        using the ARENA_ALIGN macro.

        In NDEBUG mode the RenderArena objects come from a pool which
        has 4 byte alignment. Allow the alignment to be based on the
        AllocAlignmentInteger. This define will be activated for ARMv5TE.

        https://bugs.webkit.org/show_bug.cgi?id=19946

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@59525 268f45cc-cd09-0410-ab3c-d52691b4dbfc