Fix verify_type ICE on TYPE_METHOS

[Jason Merrill]

On 05/11/2015 06:38 AM, Jan Hubicka wrote:
> -    TYPE_METHODS (type) = chainon (TYPE_METHODS (type), fn);
> +    TYPE_METHODS (type) = chainon (TYPE_METHODS (TYPE_MAIN_VARIANT (type)), fn);
>     else
>       {
> -      DECL_CHAIN (fn) = TYPE_METHODS (type);
> -      TYPE_METHODS (type) = fn;
> +      DECL_CHAIN (fn) = TYPE_METHODS (TYPE_MAIN_VARIANT (type));
> +      TYPE_METHODS (TYPE_MAIN_VARIANT (type)) = fn;

Instead, let's set type = TYPE_MAIN_VARIANT (type) at the top of the 
function.  OK with that change.

Jason