The test performs manual GC with custom GC flags.

Bug: v8:11820
Change-Id: I717411b3c32e468066060e8c4cb8b794a2fe219f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2917035
Auto-Submit: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74750}