Move bndrng from access_ref to access_data.

Move bndrng from access_ref to access_data.

gcc/ChangeLog:

	* gimple-ssa-warn-access.cc (check_access): Adjust to member name
	change.
	(pass_waccess::check_strncmp): Same.
	* pointer-query.cc (access_ref::access_ref): Remove arguments.
	Simpilfy.
	(access_data::access_data): Define new ctors.
	(access_data::set_bound): Define new member function.
	(compute_objsize_r): Remove unnecessary code.
	* pointer-query.h (struct access_ref): Remove ctor arguments.
	(struct access_data): Declare ctor overloads.
	(access_data::dst_bndrng): New member.
	(access_data::src_bndrng): New member.