Adds support for generating code to migrate instances if a map
is a migration target, to dynamic check maps.
BUG=v8:10582
Change-Id: Id26d95491869fc68a5633398d230237eb88648d9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2575058
Reviewed-by: Mythri Alle <mythria@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71658}
