Use symtab_summary in ipa-reference.c.

Use symtab_summary in ipa-reference.c.

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

	* ipa-reference.c (remove_node_data): Remove.
	(duplicate_node_data): Likewise.
	(class ipa_ref_var_info_summary_t): New class.
	(class ipa_ref_opt_summary_t): Likewise.
	(get_reference_vars_info): Use ipa_ref_var_info_summaries.
	(get_reference_optimization_summary): Use
	ipa_ref_opt_sum_summaries.
	(set_reference_vars_info): Remove.
	(set_reference_optimization_summary): Likewise.
	(ipa_init): Create summaries.
	(init_function_info): Use function summary.
	(ipa_ref_opt_summary_t::duplicate): New function.
	(ipa_ref_opt_summary_t::remove): New function.
	(get_read_write_all_from_node): Fix GNU coding style.
	(propagate): Use function summary.
	(write_node_summary_p): Fix GNU coding style.
	(stream_out_bitmap): Likewise.
	(ipa_reference_read_optimization_summary): Use function summary.
	(ipa_reference_c_finalize): Do not release hooks.

From-SVN: r261312