PATCH: revive function address warning

[DJ Delorie]

> +	    warning (0, "the address of %qD will never be NULL",
> +		     TREE_OPERAND (op0, 0));
> +	    warning (0, "the address of %qD will never be NULL",
> +		     TREE_OPERAND (op1, 0));

Do we have OPT_* options that control these?