WriteInitializerExpressions did not emit the final 'end' opcode, and
expected call sites to do so, which they did not do consistently.
We move this functionality to WriteInitializerExpression.

Change-Id: Idf42272a3dbdfd0d7f22675731e193584f75c41f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3122159
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/main@{#76532}