This will be used for Array.p.sort benchmarks to ensure that the
arrays will have the correct element kind.

R=cbruni@chromium.org, jgruber@chromium.org

Bug: v8:7382
Change-Id: I4fe58d97d7f18fd193d4432964cf6b4f5335e0e7
Reviewed-on: https://chromium-review.googlesource.com/1004754
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52511}