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iris: Enable ARB_shader_draw_parameters support

José María Casanova Crespo requested to merge chema/mesa:iris-draw_parameters into master

Additional VERTEX_ELEMENT_STATE are used to store basevertex and baseinstance and drawid updating the DWordLength of the 3DSTATE_VERTEX_ELEMENTS command.

This passes all piglit tests for spec.draw_parameters. tests and VK-GL-CTS KHR-GL45.shader_draw_parameters_tests.* tests.

Now we only mark a dirty_update when parameters are changed or when we have an indirect draw.

We enable PIPE_CAP_DRAW_PARAMETERS on Iris.

There is no edge flag support in the Vertex Elements setup.

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