This seems to have broken some dEQP tests in debug build, possibly
uncovering a previously undetected bug.

TEST=dEQP-GLES3.functional.shaders.linkage.varying.basic_types.*

This reverts commit d2328a52.

Change-Id: I9f082d7a6fca38b4c076fecc342ac40d5416ebef
Reviewed-on: https://chromium-review.googlesource.com/284780Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Olli Etuaho <oetuaho@nvidia.com>