Merge revision 7664 (revert of 7644 and 7632) to trunk.

This causes interactive tests to hit assertion in debug mode.
Review URL: http://codereview.chromium.org/6880036

git-svn-id: http://v8.googlecode.com/svn/trunk@7668 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
26 files changed