Skip Mozilla tests with timeouts.

Skip Mozilla tests with timeouts.

- Let Mozilla tests with timeouts always run in no-variants mode. Otherwise the stress-run causes a 16 minutes timeout in debug mode and 32 minutes on arm debug.
- Four test cases with exponentially long running regular expressions are skipped entirely.

BUG=
R=jkummerow@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=18916

[Michael Achenbach, 2014-01-29 14:11:11]

PTAL [+Yang for the TODOs]

[Jakob Kummerow, 2014-01-29 15:12:36]

LGTM.

To record our offline conversation:
We could put the "TIMEOUT implies NOVARIANTS" logic into the test driver, but in
non-mozilla tests, TIMEOUT means "this test is slow and sometimes times out
(maybe even only with --stress-opt), don't fail if it does", and we normally
shouldn't have tests that are expected to always time out, so marking such tests
explicitly in the status file is better.

[Michael Achenbach, 2014-01-29 15:13:53]

Committed patchset #1 manually as r18916 (presubmit successful).