iris: Initialize ice->state.prim_mode to an invalid value
It was calloc'd to 0 which is PIPE_PRIM_POINTS, which means that we fail to notice an initial primitive of points being new, and fail at updating the "primitive is points or lines" field. We do not need to reset this on device loss because we're tracking the last primitive mode sent to us on the CPU via draw_vbo, not the last primitive mode sent to the GPU. Fixes several tests: - dEQP-GLES3.functional.clipping.point.wide_point_clip - dEQP-GLES3.functional.clipping.point.wide_point_clip_viewport_center - dEQP-GLES3.functional.clipping.point.wide_point_clip_viewport_corner Fixes: dcfca0af ("iris: Set XY Clipping correctly.") (cherry picked from commit c9fb704f)
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