PR c++/25950 (DR 391)
        * call.c (struct conversion): Remove check_copy_constructor_p.
        (reference_binding): Always bind a reference directly to a
        compatible class rvalue.  Pass down LOOKUP_NO_TEMP_BIND during
        temporary creation.
        (check_constructor_callable): Remove.
        (convert_like_real): Don't call it.
        (initialize_reference): Don't call check_constructor_callable.
        (standard_conversion): Check LOOKUP_NO_CONVERSION instead of
        LOOKUP_CONSTRUCTOR_CALLABLE.  Don't require a temporary for base
        conversions if LOOKUP_NO_TEMP_BIND.
        (implicit_conversion): Pass through LOOKUP_NO_TEMP_BIND.
        (build_user_type_conversion_1): Pass through LOOKUP_NO_TEMP_BIND for
        second conversion.
        * cp-tree.h (LOOKUP_CONSTRUCTOR_CALLABLE): Remove.

From-SVN: r129596