The functionality is identical and AddEmbeddedObject makes more effort
to deduplicate handles.

Change-Id: I3d0468da28596aad09ceceb320ca4038aed60bd4
Bug: v8:8054, v8:8977, v8:7703
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1672925
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62538}