message: Add a helper to lstm_utils to return number of inputs in the fused TFL op.
diff: @@ -68,6 +68,8 @@ class ConvertLSTMCellSimpleToFusedLSTM {
  // Rewrite the func body with constructed fused lstm.
  void RewriteFunc();
  + int GetNumInputs() { return n_input_; }
  +
  protected:
  void UpdateFuncSignature();
  void GenerateFusedOpOperands();
  