A timeout result of randomly combined tests is not a useful indicator.
Therefore we ignore those now. This also prevents timeouts from being
re-run.

TBR=sergiyb@chromium.org
NOTRY=true

Bug: v8:6917
Change-Id: I8e5eb93e2f13067ca5270fb152c3dc1eda1bb3c2
Reviewed-on: https://chromium-review.googlesource.com/888559Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50879}