Eliminate the need for code delete events in CPU profiler.

tools/codemap.js

Index: tools/codemap.js
diff --git a/tools/codemap.js b/tools/codemap.js
index d7c52e8298bacf84c59532dcd6c9f3f778b9f14d..f8a4f593f07aa5fbac1f716ef0120c5a15832451 100644
--- a/tools/codemap.js
+++ b/tools/codemap.js
@@ -79,7 +79,7 @@ CodeMap.PAGE_SIZE =
  * @param {CodeMap.CodeEntry} codeEntry Code entry object.
  */
 CodeMap.prototype.addCode = function(start, codeEntry) {
-  this.removeAllCoveredNodes_(this.dynamics_, start, start + codeEntry.size);
+  this.deleteAllCoveredNodes_(this.dynamics_, start, start + codeEntry.size);
   this.dynamics_.insert(start, codeEntry);
 };
 
@@ -94,7 +94,7 @@ CodeMap.prototype.addCode = function(start, codeEntry) {
 CodeMap.prototype.moveCode = function(from, to) {
   if (from === to) return;
   var removedNode = this.dynamics_.remove(from);
-  this.removeAllCoveredNodes_(this.dynamics_, to, to + removedNode.value.size);
+  this.deleteAllCoveredNodes_(this.dynamics_, to, to + removedNode.value.size);
   this.dynamics_.insert(to, removedNode.value);
 };
 
@@ -149,28 +149,25 @@ CodeMap.prototype.markPages_ = function(start, end) {
 /**
  * @private
  */
-CodeMap.prototype.isAddressBelongsTo_ = function(addr, node) {
-  return addr >= node.key && addr < (node.key + node.value.size);
+CodeMap.prototype.deleteAllCoveredNodes_ = function(tree, start, end) {
+  var to_delete = [];
+  var addr = end - 1;
+  while (addr >= start) {
+    var node = tree.findGreatestLessThan(addr);
+    if (!node) break;
+    var start2 = node.key, end2 = start2 + node.value.size;
+    if (start2 < end && start < end2) to_delete.push(start2);
+    addr = start2 - 1;
+  }
+  for (var i = 0, l = to_delete.length; i < l; ++i) tree.remove(to_delete[i]);
 };
 
 
 /**
  * @private
  */
-CodeMap.prototype.findAllCoveredNodes_ = function(tree, start, end) {
-  var result = [];
-  var addr = end - 1;
-  while (addr >= start) {
-    var node = tree.findGreatestLessThan(addr);
-    if (!node) break;
-    var start2 = node.key, end2 = node.key + node.value.size;
-    if (start2 < end && start < end2) {
-      // Node overlaps with the interval given
-      result.push(node);
-    }
-    addr = node.key - 1;
-  }
-  return result;
+CodeMap.prototype.isAddressBelongsTo_ = function(addr, node) {
+  return addr >= node.key && addr < (node.key + node.value.size);
 };
 
 
@@ -257,14 +254,6 @@ CodeMap.prototype.getAllLibrariesEntries = function() {
 };
 
 
-CodeMap.prototype.removeAllCoveredNodes_ = function(tree, start, end) {
-  var covered = this.findAllCoveredNodes_(tree, start, end);
-  for (var i = 0, l = covered.length; i < l; ++i) {
-    tree.remove(covered[i].key);
-  }
-};
-
-
 /**
  * Creates a code entry object.
  *