This change also makes it possible to create Torque references to
elements in the context.

Change-Id: I064b73dedf8463c8d92b94b0e59f3cb4e366611a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2280084
Commit-Queue: Daniel Clifford <danno@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68677}