... when building inspector objects.

This is useful in Chromium, when recording the initiator information
for navigations.

See https://chromium-review.googlesource.com/c/chromium/src/+/1674885

Change-Id: Ib9ddcaf05586ca1f48a31921a20ab11a703ec7b0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1677381Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Alexei Filippov <alph@chromium.org>
Commit-Queue: Johannes Henkel <johannes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62389}