Just pass a pointer to the current stack. This makes it easier to reuse
the {DoReturn} method for breaks to the outermost block.

R=titzer@chromium.org

Bug: v8:8423
Change-Id: Ide8533b154daa227e044820bb9c181f836ba654a
Reviewed-on: https://chromium-review.googlesource.com/c/1370028
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Ben Titzer <titzer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58132}