Merge revisions 6831 and 6833 to the 3.0 branch.

These revisions fix a pair of crashes during deoptimization.

Review URL: http://codereview.chromium.org/6519048

git-svn-id: http://v8.googlecode.com/svn/branches/3.0@6834 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
5 files changed