... into
  src/zone/scoped-list.h
  src/zone/zone-hashmap.h
  src/zone/zone-list.h
  src/zone/zone-fwd.h

zone-fwd.h header contains zone-related forward type declarations.

Bug: v8:10506
Change-Id: Ic61b6717b3034afa24bdd49fbc0ce758a0e93c75
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2284987
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68734}