llvmpipe: Use ALIGN_STACK.

src/gallium/drivers/llvmpipe/lp_setup.c

@@ -115,6 +115,7 @@ struct setup_context {
 /**
  * Execute fragment shader for the four fragments in the quad.
  */
+ALIGN_STACK
 static void
 shade_quads(struct llvmpipe_context *llvmpipe,
             struct quad_header *quads[],