The used_or_unused_instance_size_in_words field already determines
whether the used fields are in- or out-of-object, so we can use it's
value for a fast HasOutOfObjectProperties check rather than using
NumberOfFields (which includes an iteration over the descriptor
array).

Change-Id: I6c5b4f3f793b8df7832def7465106f2af7306759
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1718152
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81828}