Fix graphical artefact when terrain heightmap shaders use rendering layer mask for lighting #5376
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Purpose of this PR
Fix for https://fogbugz.unity3d.com/f/cases/1347645/.
Terrain heightmap geometry internally use custom instancing code, but unity_RenderingLayer should be uniform to the whole terrain instance (no instancing).
Testing status
Fixed repro project in FB case.
Comments to reviewers
Notes for the reviewers you have assigned.