This reverts commit 795c0b1c.

Reason for revert: TSAN failures https://ci.chromium.org/p/v8/builders/ci/V8%20Linux64%20TSAN/33884

Original change's description:
> [Heap]: Convert Sweep to Job
>
> max concurrency is inferred from queue size for OLD_SPACE & MAP_SPACE.
> Extra Sweeper::TearDown() in MarkCompactCollector::TearDown() is needed
> to cancel job.
>
> Change-Id: Iafba7d7d24e8f6e5c5a1d5c0348dea731f0ac224
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2480783
> Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#70767}

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

Change-Id: I79dc446cef195d49780fe919091e869ddf2557a4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2500922Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70772}