ipa-icf.c: Include stor-layout.h

ipa-icf.c: Include stor-layout.h

	* ipa-icf.c: Include stor-layout.h
	(sem_function::compare_cgraph_references): Rename to ...
	(sem_item::compare_cgraph_references): ... this one.
	(sem_variable::equals_wpa): New function
	(sem_variable::equals): Do not check stuff already verified by
	equals_wpa.
	(sem_variable::equals): Reorg based on varasm.c:compare_constant.
	* ipa-icf.h (sem_item): Add compare_cgraph_references.
	(sem_function): Remove compare_cgraph_references.
	(sem_variable): Turns equals_wpa into non-inline.

From-SVN: r221096