llvmpipe: restore call to lp_setup_update_state()

This undoes part of commit 8be645d53a0d5d0ca50e4e9597043225e2231b6d
and fixes fd.o bug 28822 as well as other regressions.

The 'draw' module may issue additional state-change commands while
we're inside the draw_arrays/elements() call so it's important to
check for updated state at this point.
diff --git a/src/gallium/drivers/llvmpipe/lp_setup_vbuf.c b/src/gallium/drivers/llvmpipe/lp_setup_vbuf.c
index e53a62c..51948f5 100644
--- a/src/gallium/drivers/llvmpipe/lp_setup_vbuf.c
+++ b/src/gallium/drivers/llvmpipe/lp_setup_vbuf.c
@@ -60,6 +60,12 @@
 lp_setup_get_vertex_info(struct vbuf_render *vbr)
 {
    struct lp_setup_context *setup = lp_setup_context(vbr);
+
+   /* Vertex size/info depends on the latest state.
+    * The draw module may have issued additional state-change commands.
+    */
+   lp_setup_update_state(setup);
+
    return setup->vertex_info;
 }