Function markUpdate

docs/external/js/react-dom.development.js:18848–18852

(workInProgress)

  }

  function markUpdate(workInProgress) {
    // Tag the fiber with an update effect. This turns a Placement into
    // a PlacementAndUpdate.
    workInProgress.effectTag |= Update;
  }

  function markRef$1(workInProgress) {
    workInProgress.effectTag |= Ref;