* dwarf2read.c (die_specification, dwarf2_extension, follow_die_ref):

	* dwarf2read.c (die_specification, dwarf2_extension, follow_die_ref):
	Make the dwarf2_cu * parameter output as well as input.  Update it if
	we follow a reference to another CU.
	(read_func_scope, determine_class_name, namespace_name, dwarf2_attr)
	(die_type, die_containing_type): Update calls to changed functions.
	Use the returned CU along with the returned DIE.
	(read_namespace): Use dwarf2_attr instead of dwarf2_extension.