The problem was that transitioning element stores had a similar shape to
the new StoreGlobal case.

The problem was fixed by https://chromium-review.googlesource.com/c/457341/

BUG=v8:5561

Change-Id: If996e9b37809ba8edf6dcb228b116b77021ce7bc
Reviewed-on: https://chromium-review.googlesource.com/457324Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43992}