This reverts commit df73fd60.

Reason for revert: Reverting before branch

Original change's description:
> Reland "[rab/gsab] Temporarily stage --harmony-rab-gsab to enable fuzzing"
>
> This reverts commit 24286b8e.
>
> Reason for revert: Re-staging the experimental flag for fuzzing
>
> Original change's description:
> > Revert "[rab/gsab] Temporarily stage --harmony-rab-gsab to enable fuzzing"
> >
> > This reverts commit b8f88be0.
> >
> > Reason: disabling an experimental feature in release branch
> >
> > Bug: v8:11111,v8:12870
> > Change-Id: I6fbd6bdb318c0d25e69c04db208a0d5f2b9ebbd7
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3647357
> > Auto-Submit: Marja Hölttä <marja@chromium.org>
> > Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
> > Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
> > Cr-Commit-Position: refs/heads/main@{#80520}
>
> Bug: v8:11111,v8:12870
> Change-Id: I0a45ed5ce53010196949dda23773d152aa605846
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3647836
> Commit-Queue: Marja Hölttä <marja@chromium.org>
> Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
> Cr-Commit-Position: refs/heads/main@{#80576}

Bug: v8:11111,v8:12870
Change-Id: Ib32c1ba464dde7a5c8cc16f32680bad144bb4304
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3683358Reviewed-by: Lutz Vahl <vahl@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80888}