Function siftUp

lib/assets/react-source/development/react.js:3067–3084

(heap, node, i)

	}

	function siftUp(heap, node, i) {
	  var index = i;

	  while (true) {
	    var parentIndex = index - 1 >>> 1;
	    var parent = heap[parentIndex];

	    if (parent !== undefined && compare(parent, node) > 0) {
	      // The parent is larger. Swap positions.
	      heap[parentIndex] = node;
	      heap[index] = parent;
	      index = parentIndex;
	    } else {
	      // The parent is smaller. Exit.
	      return;
	    }
	  }
	}

	function siftDown(heap, node, i) {
	  var index = i;