We are trying to get rid of ZoneList now that List is gone, so here is a
decent place to start.

Bug: v8:6333, v8:6921
Change-Id: Ie02d3f95767a5d9946586b0efbd64ec265326fbc
Reviewed-on: https://chromium-review.googlesource.com/718377Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48554}