This reverts commit 5f8e95c1.

Reason for revert: crbug.com/1033418. TypedArrays are not, by default, concat-spreadable; the existing code is inconsistent and this CL didn't update/fix enough of it.

Original change's description:
> Fix ArrayConcat length estimation for TypedArrays
>
> TypedArrays cannot be handled on the JSArray path.
> This patch should provide a minor performance improvement while
> being functionally non-observable.
>
> Change-Id: I05259517b9079aa715b3cf4be9b0cf6bb47236ac
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1948712
> Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#65419}

TBR=jkummerow@chromium.org,ishell@chromium.org

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

Bug: chromium:1033418
Change-Id: I345c8ebc38be6df42d5bdbecd0d06d19967ad6f1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1967324
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65447}