The proposal is changing accordingly, see
https://github.com/WebAssembly/reference-types/issues/36.

In our tests we were already using the new format implicitly, because
bulk-memory-operations are enabled by default. I noticed the missing
implementation when I executed spec tests with
--no-experimental-wasm-bulk-memory.

R=mstarzinger@chromium.org

Bug: v8:7581
Change-Id: I13aaba9a8d60e8542245aac7f0a072da1be357dc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1631591Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61913}