With --stress-incremental-marking we want to start concurrent marking
faster by also sweeping pages on incremental marking steps.

Bug: v8:10315
Change-Id: Ie3fa04acc5e59a4b81c3351f4b522c78368bb1a6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2210247
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67968}