nir: print var binding in dumps.

This only useful for spir-v shaders, but I keep finding myself
having to add it.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

src/compiler/nir/nir_print.c

@@ -432,7 +432,7 @@ print_var_decl(nir_variable *var, print_state *state)
          loc = buf;
       }
 
-      fprintf(fp, " (%s, %u)%s", loc, var->data.driver_location,
+      fprintf(fp, " (%s, %u, %u)%s", loc, var->data.driver_location, var->data.binding,
               var->data.compact ? " compact" : "");
    }