pan/bi: Add base vertex to vertex ID
Indirect path tested with piglit's arb_draw_indirect-vertexid test. BaseVertex/BaseInstance support tested with arb_shader_draw_parameters-* (both the direct and indirect path).
Edited by Boris Brezillon
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Indirect path tested with piglit's arb_draw_indirect-vertexid test. BaseVertex/BaseInstance support tested with arb_shader_draw_parameters-* (both the direct and indirect path).