Now we are completely transfering marks when shifting arrays in-place.

This might lead to white free space objects in the marking deque.

R=mstarzinger@chromium.org

Review URL: http://codereview.chromium.org/8230009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9580 ce2b1a6d-e550-0410-aec6-3dcde31c8c00