* pt.c (tsubst): Clear TREE_USED for new FUNCTION_DECLs.
	* pt.c (instantiate_class_template): Make sure template
	arguments are permanent.
	* init.c (resolve_offset_ref): Don't go looking around in
	template types.
	* semantics.c: Add routines to handle expressions, and some
	declaration processing.
	* parse.y: Use them.
	(current_class_depth): Move declaration to cp-tree.h.
	* parse.c: Regenerated.
	* cp-tree.h: Use them.
	(current_class_depth): Declare.
	* pt.c (tsubst_copy): Use begin_stmt_expr and finish_stmt_expr.

From-SVN: r18882