Also enables tests for globals and mixed type use

R=gdeepti@chromium.org,bbudge@chromium.org,clemensh@chromium.org,titzer@chromium.org
BUG=v8:6020

Change-Id: I828f1628a1c27d9f07ba3a830600f81c5a404b2d
Reviewed-on: https://chromium-review.googlesource.com/1080340Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Aseem Garg <aseemgarg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53477}