expr.c (pop_type_0): Return `Object' if trying to merge two interface types.

expr.c (pop_type_0): Return `Object' if trying to merge two interface types.

	* expr.c (pop_type_0): Return `Object' if trying to merge two
	interface types.
	* verify.c (merge_types): Don't return `TYPE_UNKNOWN' for
	interface types; `Object' is always a valid supertype.

From-SVN: r36378