Otherwise, we may execute the checkpoint more often which may change
timing on GCs unnecessarily as this code path is dependen on global
memory scheduling.

Bug: chromium:967573, chromium:948807
Change-Id: I8d5812dc752638801c6729b9b0c5640c3da945d1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1631608
Auto-Submit: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61874}