This saves one indirection when fetching the supertype array for
type checks.

Bug: v8:7748
Change-Id: I41ec5a190c1ccdd9112869c7cdf1748bef4b359a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3688405Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81012}