* cp-tree.h (IDENTIFIER_TYPENAME_P): Use OPERATOR_TYPENAME_FORMAT
	here.
	(lang_type): Add is_partial_instantiation.  Decrease width of
	dummy.
	(PARTIAL_INSTANTIATION_P): New macro.
	(OPERATOR_TYPENAME_P): Remove.
	* decl.c (unary_op_p): Use IDENTIFIER_TYPENAME_P, not
	OPERATOR_TYPENAME_P.
	(grok_op_properties): Likewise.
	* friend.c (do_friend): Handle friends that are member functions
	correctly.
	* lex.c (init_parse): Use OPERATOR_TYPENAME_FORMAT.
	* pt.c (instantiate_class_template): Rework for clarity.  Avoid
	leaving TYPE_BEING_DEFINED set in obscure cases.  Don't do
	any more partial instantiation than is absolutely necessary for
	implicit typename.  Set PARTIAL_INSTANTIATION_P.
	(tsubst_decl): Use IDENTIFIER_TYPENAME_P.
	* semantics.c (begin_class_definition): Handle partial
	specializations of a type that was previously partially
	instantiated.

From-SVN: r24548