IPA ICF: include hash values of references.

IPA ICF: include hash values of references.

	* ipa-icf.c (sem_item::update_hash_by_addr_refs): New function.
	(sem_item::update_hash_by_local_refs): Likewise.
	(sem_variable::get_hash): Empty line is fixed.
	(sem_item_optimizer::execute): Include adding of hash references.
	(sem_item_optimizer::update_hash_by_addr_refs): New function.
	(sem_item_optimizer::build_hash_based_classes): Use local hash.
	* ipa-icf.h (sem_item::update_hash_by_addr_refs): New function.
	(sem_item::update_hash_by_local_refs): Likewise.

From-SVN: r221576