Spots with high smoothness setting appear pixelated on mobile devices.

Steps to reproduce:
1) Open the attached project.
2) Build 'jihiviv' scene for iOS.
3) Run on a device.
4) Swipe the slider (top-left side) towards right.

The slider is adjusting smoothness of Standard (Specular setup) shader which is used on a plane in the scene. As the smoothness values go up, reflection becomes small and very pixelated. This does not occur on standalone. Using the best graphics settings on mobile devices does not fix this issue.

Reproduced on:
5.6.0a2, 5.5.0f1, 5.4.3f1, 5.3.7p1, 5.2.4f1