This reverts commit c25352f3.

Reason for revert: Causing raytrace timeouts on TSAN:

https://ci.chromium.org/p/v8/builders/ci/V8%20Linux64%20TSAN%20-%20concurrent%20marking/13089
https://ci.chromium.org/p/v8/builders/ci/V8%20Linux64%20TSAN%20-%20concurrent%20marking/13090
https://ci.chromium.org/p/v8/builders/ci/V8%20Linux64%20TSAN%20-%20concurrent%20marking/13091

Original change's description:
> Reland "[heap] Remove sweeping state in incremental marking"
> 
> This is a reland of 7f29c48e
> 
> After fixing TSAN failures in https://crrev.com/c/2192661 and https://crrev.com/c/2193712, this CL and be relanded without changes.
> 
> Original change's description:
> > [heap] Remove sweeping state in incremental marking
> >
> > Remove the SWEEPING state from incremental marking. Sweeping is now
> > always completed when starting incremental marking. Before this change
> > there needed to be a safepoint each for starting marking and completing
> > sweeping. Now both happens within a single safepoint.
> >
> > Bug: v8:10315
> > Change-Id: Iad2835554865f2de24376372affe9a98992d1fa0
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2190419
> > Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> > Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#67678}
> 
> Bug: v8:10315
> Change-Id: Ic949d125e72c4d17fd427d08d4b6f9056721eee9
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2196182
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#67741}

TBR=ulan@chromium.org,dinfuehr@chromium.org

Change-Id: Ie529fd3bef13a28301f22876758d731e466d3939
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:10315
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2197457Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67761}