message: Instantiate for each value and index type instead of just the value type. Also typo change.
diff: @@ -189,7 +189,7 @@ void Bicg<ValueType, IndexType>::apply_impl(const LinOp *alpha, const LinOp *b,
  #define GKO_DECLARE_BICG(_type) class Bicg<_type>
  -GKO_INSTANTIATE_FOR_EACH_VALUE_TYPE(GKO_DECLARE_BICG);
  +GKO_INSTANTIATE_FOR_EACH_VALUE_AND_INDEX_TYPE(GKO_DECLARE_BICG);
  } // namespace solver
  