i965g: clean up 3DSTATE_URB emission
i965g: split emit_SURFACE_STATE into 4
i965g: add a WM workaround to GEN6 pipeline
i965g: add a MULTISAMPLE workaround to GEN6 pipeline
i965g: add a DEPTH workaround to GEN6 pipeline
i965g: clean up VS states emission
i965g: clean up 3DSTATE_CLIP
i965g: clean up SF
i965g: clean up WM
i965g: clean up BLEND_STATE
i965g: clean up DEPTH_STENCIL_STATE
i965g: reorder some GEN6 pipeline states to match i965