sdk/runtime at 472e2bce1762070bf2ffc5e8d8be3f6f24985dcc - sdk

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Ryan Macnak 472e2bce17 Revert "[vm] Streamline Zones."

This reverts commit b5922e6db4.

Reason for revert: vm/cc/AllocateZone fails on Mac

Original change's description:
> [vm] Streamline Zones.
>
>  - Don't put a HANDLESCOPE right after a StackZone, as there's no state worth restoring
>  - Remove remaining zone bookkeeping dead since e3a9d70591.
>  - Remove unnecessary resetting of handle blocks before zone deletion.
>  - Shrink initial chunk size to make Zone's overall size fit in a faster malloc size class.
>
> TEST=ci
> Change-Id: I920e12f5af93aa71fb876435764c60df485215f9
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/212261
> Reviewed-by: Siva Annamalai <asiva@google.com>
> Commit-Queue: Ryan Macnak <rmacnak@google.com>

TBR=rmacnak@google.com,asiva@google.com

Change-Id: Id23dcebb781791616e48e54d2dcd7e58159178bc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/215943
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>