* class.c (instantiate_type): Don't just return a known type if
 	it's wrong.
	* class.c (instantiate_type): Remove handling of FUNCTION_DECL
	since that code could never be reached.
	* error.c (dump_decl): Avoid aborting in the midst of printing an
	error message about an illegal template declaration.
	* parse.y (structsp): Print an error message, rather than crashing,
	when a class-head does not name a class.
	* pt.c (convert_nontype_argument):  Allow REAL_TYPE and COMPLEX_TYPE
	template arguments as a g++ extension.
	* cp-tree.def (ALIGNOF_EXPR): New tree code.
	* decl2.c (grok_alignof): If processing_template_decl, just store
	the expression.
	* typeck.c (c_alignof): Likewise.
	* decl2.c (build_expr_from_tree): Handle ALIGNOF_EXPR.
	* error.c (dump_expr): Likewise.
	* pt.c (tsubst_copy): Likewise.
	* tree.c (cp_tree_equal): Likewise.
	* pt.c (uses_template_parms): Correctly determine whether or not a
	SIZEOF_EXPR/ALIGNOF_EXPR uses template parameters so that constant
	folding can be done.

From-SVN: r17545