modref_access_node cleanup

modref_access_node cleanup

move member functions of modref_access_node from ipa-modref-tree.h to
ipa-modref-tree.c since they become long and not fitting for inlines anyway.  I
also cleaned up the interface by making static insert method (which handles
inserting accesses into a vector and optimizing them) which makes it possible
to hide most of the interface handling interval merging private.

Honza

gcc/ChangeLog:

	* ipa-modref-tree.h
	(struct modref_access_node): Move longer member functions to
	ipa-modref-tree.c
	(modref_ref_node::try_merge_with): Turn into modreef_acces_node member
	function.
	* ipa-modref-tree.c (modref_access_node::contains): Move here
	from ipa-modref-tree.h.
	(modref_access_node::update): Likewise.
	(modref_access_node::merge): Likewise.
	(modref_access_node::closer_pair_p): Likewise.
	(modref_access_node::forced_merge): Likewise.
	(modref_access_node::update2): Likewise.
	(modref_access_node::combined_offsets): Likewise.
	(modref_access_node::try_merge_with): Likewise.
	(modref_access_node::insert): Likewise.