https://codereview.appspot.com/54760043/ patch 6 release candidate


git-svn-id: http://es-lab.googlecode.com/svn/trunk@861 aeea10e6-ec39-11de-83d8-6d5adf01d787
FF Nightly 30 has a more refined stack format for evaled code


git-svn-id: http://es-lab.googlecode.com/svn/trunk@862 aeea10e6-ec39-11de-83d8-6d5adf01d787
Use the eval stack, not the call to eval


git-svn-id: http://es-lab.googlecode.com/svn/trunk@863 aeea10e6-ec39-11de-83d8-6d5adf01d787