Use func_checker::hash_operand for hashing of GIMPLE operands.

Use func_checker::hash_operand for hashing of GIMPLE operands.

2019-11-14  Martin Liska  <mliska@suse.cz>

	* ipa-icf-gimple.h (func_checker::func_checker): Add
	default constructor.
	* ipa-icf.c (sem_function::init): Make operand_equal_p
	and hash_operand public.
	(sem_item::add_expr): Remove.
	(sem_item::add_type): Remove.
	(sem_function::hash_stmt): Use m_checker for hashing
	of GIMPLE statements.
	(sem_function::parse): Init with checker.
	(sem_variable::parse): Pass NULL as checker.
	(sem_item_optimizer::parse_funcs_and_vars):
	Pass checker to ::parse function.
	(sem_item_optimizer::parse_nonsingleton_classes): Likewise.
	(sem_variable::parse): New function.
	(sem_variable::get_hash): Only return computed hash value.
	(sem_variable::init): Initialize hash of a variable.
	* ipa-icf.h: Remove add_expr, add_type and add func_checker
	to couple of functions as a new argument.

From-SVN: r278207