Revert "Make Object.freeze fast"
and "Fix Object.freeze on dictionary-backed arrays to properly freeze elements"

This reverts r14758 and r14759 due to introducing failures in Test262

TBR=verwaest@chromium.org

Review URL: https://codereview.chromium.org/15681004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14760 ce2b1a6d-e550-0410-aec6-3dcde31c8c00