Revert "[vm] Initialize large typed arrays only once."

This reverts commit 6fcee199af37e2f9776e1f292c0786969798847c.

Reason for revert: Wrong size logic

Original change's description:
> [vm] Initialize large typed arrays only once.
> 
> Previously large (>256k) typed arrays would be initialized 3 times:
>  - The OS initializing the new virtual memory to zero
>  - Object::InitializeObject initializing to object null
>  - TypedData::New reinitializing to zero
> 
> Change-Id: I432944919ab68aecb2038bba245594bbbaed9093
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/130928
> Commit-Queue: Ryan Macnak <rmacnak@google.com>
> Reviewed-by: Alexander Aprelev <aam@google.com>
> Reviewed-by: Martin Kustermann <kustermann@google.com>

TBR=kustermann@google.com,aam@google.com,rmacnak@google.com

Change-Id: I92818954ddd715f295c1cbe413733236970a991e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/133661
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>