The element segment encoding in the bulk memory proposal changed
recently. With this CL the V8 implementation gets up to date again.

R=thibaudm@chromium.org

Bug: v8:9658
Change-Id: I4f45d04369400356a6f3aaed9570c7870f5f97bd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1778022Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63836}