Kill IDENTIFIER_NAMESPACE_BINDINGS

	Kill IDENTIFIER_NAMESPACE_BINDINGS
	* cp-tree.h (lang_identifier): Delete namespace_bindings.
	(IDENTIFIER_NAMESPACE_BINDINGS): Delete.
	(lang_decl_ns): Add bindings.
	(DECL_NAMESPACE_BINDINGS): New.
	* lex.c (retrofit_lang_decl): Create namespace hash table.
	* name-lookup.c (find_namespace_slot): Change to use hash-map.
	* ptree.c (cxx_print_binding): Delete.
	(cxx_print_identifier): Remove NAMESPACE_BINDING printing.

From-SVN: r248694