This reverts commit 8358ab49.

Reason for revert: TSan issues: https://ci.chromium.org/p/v8/builders/ci/V8%20Linux64%20TSAN/33730

Original change's description:
> [heap] Introduce new state in CollectionBarrier
>
> Introduce new state kCollectionStarted in CollectionBarrier. This state
> is used during Heap::PerformGarbageCollection. It stops threads from
> requesting GC when the GC was already started. This happens because a
> background thread only requests the GC after it parked itself - the GC
> could be started in-between those two events.
>
> Bug: v8:10315
> Change-Id: I59cf3d4ea41c7a2c37ffce89c5b057221a2499e0
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2474858
> Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#70572}

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

Change-Id: Ia67b1cbb931ce1b965876c7a1bbb09f48b8c7b43
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:10315
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2480563Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70576}