... instead of obj.IsCode() because it's not safe to use the latter
during GC which might have already moved the object.

Bug: v8:11880, chromium:1292688
Change-Id: Idbe973c0b1919a79c6aa66a8f490d952266aa66d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3429209
Auto-Submit: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78898}