These guards are needed since the third part heaps don't use the
deserialization reservation system.

Bug: v8:9533
Change-Id: I0e8bd7928581979bed15abdfaf639c9fdfc8a30f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2030908
Commit-Queue: Steve Blackburn <steveblackburn@google.com>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66108}