gimple.c (gtc_visit): Compare TREE_ADDRESSABLE, handle NULLPTR_TYPE similar to VOID_TYPE.

gimple.c (gtc_visit): Compare TREE_ADDRESSABLE, handle NULLPTR_TYPE similar to VOID_TYPE.

2011-05-12  Richard Guenther  <rguenther@suse.de>

	* gimple.c (gtc_visit): Compare TREE_ADDRESSABLE, handle
	NULLPTR_TYPE similar to VOID_TYPE.  Defer type-leader lookup
	until after simple checks.
	(gimple_types_compatible_p): Likewise.
	(iterative_hash_gimple_type): Always hash pointer targets
	and function return and argument types.
	(iterative_hash_canonical_type): Do not hash TYPE_QUALS,
	hash TYPE_ALIGN.  Do not hash TYPE_MIN/MAX_VALUE.
	(gimple_canonical_types_compatible_p): Compare TREE_ADDRESSABLE,
	handle NULLPTR_TYPE similar to VOID_TYPE.  Handle non-aggregates
	completely in the simple compare section.
	(gimple_register_canonical_type): Query the cache again after
	registering.

From-SVN: r173704