Temporarily disable mjsunit/regress/regress-2612 to make our tree green again.

TBR=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/40203002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17379 ce2b1a6d-e550-0410-aec6-3dcde31c8c00