This reverts commit cf9a28b6.

Reason for revert: TSAN failures: https://ci.chromium.org/p/v8/builders/ci/V8%20Linux64%20TSAN/34374?

Original change's description:
> [wasm] Reduce job priority once baseline compilation finishes
>
> This Cl changes the priority of baseline compilation from kUserVisible
> to kUserBlocking. Once baseline compilation finishes, the priority is
> reduced to kUserVisible. The reason for using kUserBlocking is that
> thereby TurboFan compilation cannot block Liftoff compilation anymore.
> Additionally, kUserBlocking is quite appropriate, as the initial
> compilation does block a whole section of a web app from execution.
>
> R=​clemensb@chromium.org
>
> Bug: v8:11088
> Change-Id: Ifde42d20f36d4c0a5122b0008311ccdffbb60e48
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2519559
> Commit-Queue: Andreas Haas <ahaas@chromium.org>
> Reviewed-by: Clemens Backes <clemensb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#71404}

TBR=ahaas@chromium.org,clemensb@chromium.org

Change-Id: I9a975c4c43189015491b08d3a98de991d8167daf
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:11088
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2560200Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71409}