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OES_geometry_shader: Test dynamically non-uniform num vertices

Neil Roberts requested to merge nroberts/piglit:nroberts/v3d-nonuniform-gs into master

Adds a test containing a geometry shader which emits three squares as triangle strips. The middle square is conditionally emitted depending on a vertex attribute. The test is intended to reproduce the bug in Mesa issue 3150. On V3D, this was causing a problem where the offset to store the final vertex becomes non-uniform across the lanes.

Issue: mesa#3150 (closed)

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