s/&/,/

Bug: v8:12191
Change-Id: Ib933470455c4a0f6e133bd1277cc2bba6aa83e12
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3158549Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Francis McCabe <fgm@chromium.org>
Cr-Commit-Position: refs/heads/main@{#76817}