(alpha_builtin_saveregs): Refine last change to work for both stdarg

and varargs.

From-SVN: r9470

gcc/config/alpha/alpha.c

@@ -1144,7 +1144,7 @@ alpha_builtin_saveregs (arglist)
      order to account for the integer arg registers which are counted in
      argsize above, but which are not actually stored on the stack.  */
 
-  addr = (current_function_args_info <= 5
+  addr = (current_function_args_info <= 5 + stdarg
 	  ? plus_constant (virtual_incoming_args_rtx, 6 * UNITS_PER_WORD)
 	  : plus_constant (virtual_incoming_args_rtx, - (6 * UNITS_PER_WORD)));