Revert "Make new space iterable when transitioning double array to objects"

This reverts r20603.

BUG=

Review URL: https://codereview.chromium.org/230863003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20626 ce2b1a6d-e550-0410-aec6-3dcde31c8c00