This also introduces FrameStateInfoOf helper.

Bug: v8:7517, v8:7310
Change-Id: If2dd1257fb9384fe957a980077a65154cc014d3b
Reviewed-on: https://chromium-review.googlesource.com/946009
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51718}