Comparing structures that contain arrays to each other and assigning
structures that contain arrays is "not defined" in ESSL 1.00 (section
5.7). Sections 5.8 and 5.9 further suggest that these operations are not
allowed. Additionally some platform drivers on Linux seem to reject
shaders produced by ANGLE which compare structures containing arrays.
This might require changing the output GLSL version for ESSL 3.00.

BUG=angleproject:954
TEST=angle_unittests

Change-Id: I5f3a016f360f940f2fc1ec1ff8e60d13a977eb69
Reviewed-on: https://chromium-review.googlesource.com/261531Reviewed-by: Olli Etuaho <oetuaho@nvidia.com>
Tested-by: Olli Etuaho <oetuaho@nvidia.com>