This CL ensures that the frame pointer register is set to the innermost
frame for builtin continuations. To make this work, this CL contains a
temporary fix for NotifyDeoptimized, which needs to skip these frames
in order to obtain a valid JavaScript context.

Bug: v8:7584, v8:7639
Change-Id: I8ea318e5441950fdf45d909e1f3ee649daf38dca
Reviewed-on: https://chromium-review.googlesource.com/1001899Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52479}