We now cast it into a DescriptorArrayData where appropiate, as we do
with all the other Data members.

Bug: v8:7790
Change-Id: I5be0aab9c4e80ae246c58a8df719308a0d475e6c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2534816
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71174}