[turbolizer] Improve code comments in disassembly

tools/turbolizer/code-view.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 var CodeView = function(divID, PR, sourceText, sourcePosition, broker) {
   "use strict";
   var view = this;
 
   view.divElement = document.getElementById(divID);
   view.broker = broker;
@@ skipping 12 matching lines @@
         if (selected) {
           span.classList.add("selected");
         } else {
           span.classList.remove("selected");
         }
       }
       var ranges = [];
       for (var span of items) {
         ranges.push([span.start, span.end, null]);
       }
+      broker.clear(selectionHandler);
       broker.select(selectionHandler, ranges, selected);
     },
     selectionDifference: function(span1, inclusive1, span2, inclusive2) {
       var pos1 = span1.start;
       var pos2 = span2.start;
       var result = [];
       var lineListDiv = view.divElement.firstChild.firstChild.childNodes;
       for (var i=0; i < lineListDiv.length; i++) {
         var currentLineElement = lineListDiv[i];
         var spans = currentLineElement.childNodes;
@@ skipping 125 matching lines @@
 
   this.resizeToParent();
 }
 
 CodeView.prototype.resizeToParent = function() {
   var view = this;
   var documentElement = document.documentElement;
   var y = view.divElement.parentNode.clientHeight || documentElement.clientHeight;
   view.divElement.style.height = y + "px";
 }