Skip test on mips.

PASS/FAIL is not enough as the test result is CRASH.

R=yangguo@chromium.org
TBR=yangguo@chromium.org
BUG=v8:3457
LOG=n

Review URL: https://codereview.chromium.org/415773005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22590 ce2b1a6d-e550-0410-aec6-3dcde31c8c00