code: function initBindings() {
      ngDevMode && assertEqual(viewData[BINDING_INDEX], -1, 'Binding index should not yet be set ' + viewData[BINDING_INDEX]);
      if (tView.bindingStartIndex === -1) {
          tView.bindingStartIndex = viewData.length;
      }
      viewData[BINDING_INDEX] = tView.bindingStartIndex;
  }
docs: Initializes the binding start index. Will get inlined.
  
  This function must be called before any binding related function is called
  (ie `bind()`, `interpolationX()`, `pureFunctionX()`)