This flips the flag to enable wasm code gc by default. Note that
chromium override this default, so it will need a separate CL.

R=mstarzinger@chromium.org
CC=hablich@chromium.org

Bug: v8:8217
Change-Id: If638fbda423449ed576237745db284dc449fb467
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1687674Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62510}