* fold-const.c (exact_real_inverse): Move variable `float_error'
        into the scope where it is used.
        (const_binop_1): New static function.
        (cb_args): New struct.
        (const_binop): Use them in call to `do_float_handler'.
        (fold_convert_1): New static function.
        (fc_args): New struct.
        (fold_convert): Use them in call to `do_float_handler'.

From-SVN: r25776