* typeck.c (require_complete_type): Use complete_type_or_else.
	(complete_type_or_else): Always return NULL_TREE on failure, as
	documented.
	* pt.c (tsubst_aggr_type): Prototype.
	(tsubst_decl): New function, split out from tsubst.  Set
	input_filename and lineno as appropriate.
	(pop_tinst_level): Restore the file and line number saved in
	push_tinst_level.
	(instantiate_class_template): Set input_filename and lineno as
	appropriate.
	(tsubst): Move _DECL processing to tsubst_decl.  Make sure the
	context for a TYPENAME_TYPE is complete.
	* decl2.c (grokbitfield): Issue errors on bitfields declared with
	function type.
	(do_dtors): As in do_ctors, pretend to be a member of the same
	class as a static data member while generating a call to its
	destructor.

From-SVN: r21627