This reverts commit d746be9c.

Reason for revert: Speculative revert because this CL *might* cause timeouts on several bots:
https://ci.chromium.org/p/v8/builders/ci/V8%20Linux%20-%20predictable/23351

Original change's description:
> [wasm] Use work-stealing queues for background compilation
> 
> This reduces contention on the mutex protecting the {CompilationState}
> by splitting the compilation unit queues into several queues (one per
> background task). Each task executes its own queue first, and steals
> from other queues once it runs out of work.
> The implementation of the set of work-stealing queues is encapsulated
> in the new {CompilationUnitQueues} class in module-compiler.cc.
> 
> R=​titzer@chromium.org
> 
> Bug: v8:8916
> Change-Id: I5a40314917e7d4a35d7ff9e8ec124ec212beacab
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1543350
> Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#60572}

TBR=mstarzinger@chromium.org,titzer@chromium.org,clemensh@chromium.org

Change-Id: I92d8862ec0ff0002160a62ed9df9b044fc95c93d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:8916
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1549166Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60576}