Disable handle zapping on 3.25 branch in release mode

R=jochen@chromium.org

Review URL: https://codereview.chromium.org/212973004

git-svn-id: https://v8.googlecode.com/svn/branches/3.25@20384 ce2b1a6d-e550-0410-aec6-3dcde31c8c00