mjsunit/big-object-literal will exhaust the stack in debug builds,
due to different compiler settings. It will work in optdebug.
This disables for both. Adding an 'optdebug' test to .status files
is easy, but I don't want to contribute to the 'mode x variant explosion'.

R=jochen@chromium.org
CC=franzih@chromium.org, machenbach@chromium.org

Review-Url: https://codereview.chromium.org/2609193002
Cr-Commit-Position: refs/heads/master@{#42061}