Revert _binding -> _value change.

Revert _binding -> _value change.

	* name-lookup.h (get_namespace_value, set_global_value): Rename to
	...
	(get_namespace_binding, set_global_binding): ... these.
	* name-lookup.c (get_namespace_value, set_global_value): Rename to
	...
	(get_namespace_binding, set_global_binding): ... these.
	(arg_assoc_namespace, pushdecl_maybe_friend_1)
	check_for_out_of_scope_variable, push_overloaded_decl_1,
	lookup_name_innermost_nonclass_level, push_namespace): Adjust.
	* cp-tree.h (IDENTIFIER_GLOBAL_VALUE)
	SET_IDENTIFIER_GLOBAL_VALUE): Adjust.
	* decl.c (poplevel): Adjust.
	* pt.c (make_constrained_auto): Likewise.
((--This line, and those below, will be ignored--

M    cp/cp-tree.h
M    cp/name-lookup.c
M    cp/name-lookup.h
M    cp/decl.c
M    cp/ChangeLog
M    cp/pt.c

From-SVN: r247745