* tree.c (get_unwidened): Decide whether to narrow a bitfield
        reference based on TYPE_SIZE, not TYPE_PRECISION.
        * cp/cvt.c (convert_to_void): Don't warn about the RHS of a comma
        being useless if TREE_NO_UNUSED_WARNING is set.

        * stmt.c (parse_output_constraint): Warn about in-out constraint
        that doesn't allow a register.
        (parse_input_constraint): Warn about matching constraint that
        doesn't allow a register.

From-SVN: r74871