Drive-by-fix: Handle duplicate globals names correctly in the
scope exposed module object.

Bug: chromium:1127914, chromium:1071432
Change-Id: I697256642c5ddbc13f86ff25ab012c53537b9c88
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2609416
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Auto-Submit: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71910}