support primitive ID
Th MR doesn't give me regressions, but I was not able to test the use of primitive ID itslef because this requires at least working GS, and the piglits with primitiveid in the name are all from arb_tesselation_shaders tests.
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Th MR doesn't give me regressions, but I was not able to test the use of primitive ID itslef because this requires at least working GS, and the piglits with primitiveid in the name are all from arb_tesselation_shaders tests.