New space size needs to be adjusted during global safepoint.

Bug: v8:10315
Change-Id: I670024faa55ce68a4091af6f358f45d20c66fa0b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2239573Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69301}