TF_RET_CHECK(host_fdef);
    TF_RETURN_IF_ERROR(FunctionDefToBodyHelper(*host_fdef, AttrSlice(&attrs),
                                               fld, &host_fbody));

    // We use ReverseDFS() to copy nodes. Make sure all nodes are reverse
    // reachable from sink node so all nodes will be copied.
    // TODO(b/77601805): consolidate copy graph functions.
    FixupSourceAndSinkEdges(host_fbody->graph);