const Node& node, string* uncompilable_reason) const {
  // There is a SymbolicGradient kernel on the XLA_JIT device, but the gradient
  // is really a kind of function call and will be handled by
  // IsCompilableCall().
  if (node.type_string() == "SymbolicGradient") {
    *uncompilable_reason =
        "SymbolicGradient should be handled by IsCompilableCall().";
    return false;
  }