Disable GC stress for mjsunit/opt-elements.kind test.

R=mvstanton@chromium.org
TEST=mjsunit/opt-elements-kind (in GC stress mode)

Review URL: https://codereview.chromium.org/23889043

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16916 ce2b1a6d-e550-0410-aec6-3dcde31c8c00