This reverts commit 34e3e7f9.

Reason for revert:
https://build.chromium.org/p/client.v8/builders/V8%20Fuchsia/builds/474

Original change's description:
> Introduce gc flag for fuzzing over compaction.
> 
> Bug: v8:6972
> Change-Id: If1f4ee04ae00c6ae1e037bbb1ca758e952a8f843
> Reviewed-on: https://chromium-review.googlesource.com/738112
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Reviewed-by: Hannes Payer <hpayer@chromium.org>
> Commit-Queue: Michał Majewski <majeski@google.com>
> Cr-Commit-Position: refs/heads/master@{#49191}

TBR=machenbach@chromium.org,hpayer@chromium.org,majeski@google.com

Change-Id: I63a14763a4958c948fbcad1e75c284abb580e7be
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:6972
Reviewed-on: https://chromium-review.googlesource.com/755596Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49192}