* pt.c (find_parameter_packs_r) [IF_STMT]: Don't walk into
	IF_STMT_EXTRA_ARGS.
	* tree.c (cp_walk_subtrees) [DECLTYPE_TYPE]: Set
	cp_unevaluated_operand.
	[ALIGNOF_EXPR] [SIZEOF_EXPR] [NOEXCEPT_EXPR]: Likewise.

From-SVN: r262825