Merge r6592, r6612, r6618, r6626 and r6636 into 2.4 branch

Review URL: http://codereview.chromium.org/6250133

git-svn-id: http://v8.googlecode.com/svn/branches/2.4@6642 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
6 files changed