Reproduction steps:
1. Open the attached project "DistancePrecisionRepro.zip";
2. Open the Sphere_500000 scene;
3. Notice that the Sphere's Z position is set to 500000.

Expected results: the texture of the sphere should be smooth without any pattern even if position of the GameObject is very far away from origins;
Actual results: The texture has patterns.

Reproduced on: 5.6.3p2, 2017.1.1f1, 2017.2.0b9, 2017.3.0a6.
Not reproduced on: 5.5.3p3, 5.6.0a1.
Regression started in: 5.6.0a2.