Port IPA CP to edge_clone_summaries.

Port IPA CP to edge_clone_summaries.

2018-06-08  Martin Liska  <mliska@suse.cz>

	* ipa-cp.c (class edge_clone_summary): New summary.
	(grow_edge_clone_vectors): Remove.
	(ipcp_edge_duplication_hook): Remove.
	(class edge_clone_summary_t): New call_summary class.
	(ipcp_edge_removal_hook): Remove.
	(edge_clone_summary_t::duplicate): New function.
	(get_next_cgraph_edge_clone): Use edge_clone_summaries.
	(create_specialized_node): Likewise.
	(ipcp_driver): Initialize edge_clone_summaries and do not
	register hooks.

From-SVN: r261317