This reverts commit a596efcc.

Reason for revert: Was incorrect. Holes can appear in dead code.

Original change's description:
> [turbofan] Refine a DCHECK
>
> Hole checks are done using a lower level comparison.
>
> Change-Id: I61c5b787f12564ad3553d395a36938a00f5dd554
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2172418
> Auto-Submit: Georg Neis <neis@chromium.org>
> Commit-Queue: Nico Hartmann <nicohartmann@chromium.org>
> Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#67466}

TBR=neis@chromium.org,nicohartmann@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: I47aff68cf8e224882a3eeac0d9edfe5a6228f0f2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2181324
Commit-Queue: Georg Neis <neis@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67561}