message: Remove obsolete TODO. All variants of LSTM have been supported.
diff: @@ -127,7 +127,6 @@ struct OperatorProperty {
  };
  // The op as well as it variants.
  -// TODO(b/174283888): extend it to support ops that has multiple variants.
  struct OpVariant {
  BuiltinOperator op_code;
  bool use_layer_norm = false;
  