These were to be lifted in "Fix non-square matrix uniform packing."

BUG=angleproject:1923

Change-Id: I6c5cc973f9dff31ffefdfda9fe640b97d28799ad
Reviewed-on: https://chromium-review.googlesource.com/455466Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Olli Etuaho <oetuaho@nvidia.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>