GitLab

1) Traces show that it can take a relatively long time before Oilpan
   starts flushing v8 references (e.g. ~10 steps spent just on the
   bailout worklist). This CL moves v8 references flushing before
   processing of the bailout worklist.
2) Traces also show that a shorter duration for the first marking step
   can suffice.

Bug: 986235
Change-Id: If7bad026e91f1fdf1899035bda049834e7bffab5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339356
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Auto-Submit: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795059}