This change adds support for defining globals whose value is imported
and not defined inline. This was already possible for importing globals
from other modules, now it is also supported for non-global values, e.g.
values created by a wasm function and exported to JS.

Bug: v8:7748
Change-Id: I4fe22a7ab33b431cb731458900c0f332dff8b8f7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3865554Reviewed-by: Manos Koukoutos <manoskouk@chromium.org>
Commit-Queue: Matthias Liedtke <mliedtke@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82934}