This patch ensures that the serializer does not read the field of
the DescriptorArray that can be changed concurrently by GC.

Bug: v8:8803
Change-Id: I849fd2278abd228a46351ab18efb8bfd201ceafc
Reviewed-on: https://chromium-review.googlesource.com/c/1458239
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59465}