... by migrating old-style code
  MyObject* obj = new (zone) MyObject(...)

to the new style
  MyObject* obj = zone->New<MyObject>(...)

... and prohibiting accidental use of the old-style.

Bug: v8:10689
Change-Id: Id75774ac12e3d0f95cb3a538066dffbf7815e438
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2300490
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68905}