This reverts commit 23b178b5.

Reason for revert: Speculative revert due to https://ci.chromium.org/ui/p/chromium/builders/try/linux-rel/945522/overview

Original change's description:
> [turbofan] Enable --verify-simplified-lowering in debug
>
> Bug: v8:12619
> Change-Id: I3b9f82a21c9454ff37036e8abcf73862e38f1fc9
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3494243
> Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
> Auto-Submit: Nico Hartmann <nicohartmann@chromium.org>
> Commit-Queue: Nico Hartmann <nicohartmann@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#79338}

Bug: v8:12619
Change-Id: Ia879b53e1b0a07109f0420fdf954b110f45abf58
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3497339
Auto-Submit: Nico Hartmann <nicohartmann@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#79354}