message: fix bug in GKO_DECLARE_BICG
diff: @@ -188,7 +188,7 @@ void Bicg<ValueType, IndexType>::apply_impl(const LinOp *alpha, const LinOp *b,
  }
  -#define GKO_DECLARE_BICG(_type) class Bicg<_type>
  +#define GKO_DECLARE_BICG(_vtype, _itype) class Bicg<_vtype, _itype>
  GKO_INSTANTIATE_FOR_EACH_VALUE_AND_INDEX_TYPE(GKO_DECLARE_BICG);
  