* ipa-cp.c (ipcp_update_callgraph): Use ipa_is_param_used.

	* ipa-cp.c (ipcp_update_callgraph): Use ipa_is_param_used.
	(ipcp_estimate_growth): Likewise.
	(ipcp_const_param_count): Likewise.
	(ipcp_insert_stage): Likewise.
	* ipa-prop.c (visit_load_for_mod_analysis): New function.
	(visit_store_addr_for_mod_analysis): Set used flag.
	(ipa_detect_param_modifications): Set used flag for SSE params;
	update use of walk_stmt_load_store_addr_ops.
	(ipa_print_node_params): Print used flag.
	(ipa_write_node_info): Stream used flag.
	(ipa_read_node_info): Likewise.
	* ipa-prop.h (struct ipa_param_descriptor): Add used field.
	(ipa_is_param_used): New function.
	(lto_ipa_fixup_call_notes): Remove unused declaration.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@159513 138bc75d-0d04-0410-961f-82ee72b054a4