This reverts commit 7c7cdec5.

Reason for revert: speculative revert for https://logs.chromium.org/logs/v8/buildbucket/cr-buildbucket.appspot.com/8849515345192311664/+/u/Check_-_stress_concurrent_allocation/deopt-pretenure

Original change's description:
> [TurboFan] Fix SpeculativeNumberEqual[Number] with undefined
>
> Bug: chromium:1198309, v8:5660
> Change-Id: I9cb5f66643c0c0ab9b18ca953cf85d2f6aa84b42
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2827899
> Reviewed-by: Georg Neis <neis@chromium.org>
> Commit-Queue: Nico Hartmann <nicohartmann@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#74038}

Bug: chromium:1198309
Bug: v8:5660
Change-Id: I91eef4a6bb85245b82086c91798ca3d650854f52
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2836097Reviewed-by: Sathya Gunasekaran  <gsathya@chromium.org>
Commit-Queue: Sathya Gunasekaran  <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74040}