v8: reimplement `getHeapStatistics`
Reimplement getHeapStatistics without smalloc as it is going to be removed soon.
R=@trevnorris @bnoordhuis
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Reimplement getHeapStatistics without smalloc as it is going to be removed soon.
R=@trevnorris @bnoordhuis