re PR c++/17743 (dependent expressions in attributes)

        PR c++/17743
        * pt.c (apply_late_template_attributes): Set processing_template_decl.
        (tsubst_decl) [TYPE_DECL]: Preserve naming typedef, pass
        ATTR_FLAG_TYPE_IN_PLACE.
        (tsubst): Do unqualified lookup to find typedefs from current class.
        [ARRAY_TYPE]: Propagate alignment info.
        * decl2.c (is_late_template_attribute): Only defer handling of
        attribute aligned if the expression is dependent.
        (save_template_attributes): If we're deferring any attributes,
        make this a naming typedef.

From-SVN: r128590