* ipa-icf.c (sem_item::compare_attributes): New function.
	(sem_item::compare_referenced_symbol_properties): Compare variable
	attributes.
	(sem_item::hash_referenced_symbol_properties): Record DECL_ALIGN.
	(sem_function::param_used_p): New function.
	(sem_function::equals_wpa): Fix attribute comparsion; match
	parameter type codes; do not compare paremter flags when
	they are not used; compare edge flags; compare indirect calls.
	(sem_item::update_hash_by_addr_refs): Hash reference type.
	(sem_function::equals_private): Do not match DECL_ATTRIBUTES.
	(sem_variable::equals_wpa): Do not match DECL_ALIGN; match
	reference use type.
	(sem_item_optimizer::update_hash_by_addr_refs): Use param_used_p.
	* ipa-icf.h (compare_attributes, param_used_p): Declare.

From-SVN: r222374