I don't see any reason why we need to convert the 'uninitialized'
Oddball into a Smi 0 in the Smi case, nor why we need to convert the
hole-NaN HeapNumber into the Oddball in the Tagged case. These are
temporary anyways.

Change-Id: Ifdcd67528c7b19c36a1bde11291d78c3f211897f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2953291Reviewed-by: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75151}