This reverts commit fc48a228.

Reason for revert: fails tsan: https://ci.chromium.org/p/v8/builders/ci/V8%20Linux64%20TSAN%20-%20concurrent%20marking/13871

Original change's description:
> Reland "[heap] Move start of incremental marking in allocation"
> 
> This is a reland of d6a14abe
> 
> Test wasn't written with incremental/concurrent marking in mind, so
> simply disabling it for this particular unittest.
> 
> Original change's description:
> > [heap] Move start of incremental marking in allocation
> >
> > Move start of incremental marking out of
> > RefillLinearAllocationAreaFromFreeList. This avoids a potential
> > safepoint while holding allocation_mutex_.
> >
> > Bug: v8:10315
> > Change-Id: Ieb60ac68f26199eea7b6b7ad6d874851382f3d69
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2287496
> > Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
> > Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#68751}
> 
> Bug: v8:10315
> Change-Id: I2a665400d9a784b1557474a051839d5c8b45e9e2
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2292241
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#68818}

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

Change-Id: I9063a942c050b79cd3b66226dc25651ccf9fa60a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:10315
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2295361Reviewed-by: Sathya Gunasekaran  <gsathya@chromium.org>
Commit-Queue: Sathya Gunasekaran  <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68826}