This CL cancels concurrent workers instead of joining them in
MarkLiveObjects. Joining could trigger another costly run.

Bug: v8:13012
Change-Id: I873db6e9d612e219060de0fa2447f6c7c0e9de3b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3885876Reviewed-by: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Leon Bettscheider <bettscheider@google.com>
Cr-Commit-Position: refs/heads/main@{#83105}