message: Remove stale TODO in TFLite
  It was a random thought we never addressed.
  The current test is actually good enough.
diff: @@ -36,9 +36,6 @@ class WhileTest : public ControlFlowOpTest {};
  // The test builds a model that produces the i-th number of
  // triangular number sequence.
  -//
  -// TODO(ycling): Consider to improve this test case by adding a
  -// concat into the body subgraph.
  TEST_F(WhileTest, TestTriangularNumberSequence) {
  const std::vector<int> expected = {1, 3, 6, 10, 15, 21, 28};
  for (int i = 0; i < expected.size(); ++i) {
  