Suppress GC stress failure for a test that asserts code being optimized.

The reason is that GC stress causes additional deopts that the test
originally did not foresee.

R=marja@chromium.org

Review URL: https://codereview.chromium.org/355973003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22034 ce2b1a6d-e550-0410-aec6-3dcde31c8c00