Timeouts on num-fuzzer only lead to false positives, as tests might
take unpredictably longer.

This CL forgives timeouts through a global override mechanism of the
expected outcomes. This allows to remove already existing scattered
code that allowed timeouts in some test suites only.

Bug: v8:6917
Change-Id: Ib131765d360e335789c1952bc6793ed051e016ea
Reviewed-on: https://chromium-review.googlesource.com/908454
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51188}