Add runtimeType() to Object which returns canonicalized instances of Type.

lib/compiler/implementation/enqueue.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class EnqueueTask extends CompilerTask {
   final Enqueuer codegen;
   final Enqueuer resolution;
 
   String get name => 'Enqueue';
 
@@ skipping 229 matching lines @@
     });
   }
 
   void registerNewSelector(SourceString name,
                            Selector selector,
                            Map<SourceString, Set<Selector>> selectorsMap) {
     if (name != selector.name) {
       String message = "$name != ${selector.name} (${selector.kind})";
       compiler.internalError("Wrong selector name: $message.");
     }
+    if (name == const SourceString('runtimeType')
+        && selector.argumentCount == 0) {
+      compiler.enabledRuntimeType = true;

[ngeoffray, 2012/09/14 07:30:21]

I'd prefer doing the check on the Element. There are usually way more selectors
than elements.

[karlklose, 2012/09/14 12:07:13]

Done.

+    }
     Set<Selector> selectors =
         selectorsMap.putIfAbsent(name, () => new Set<Selector>());
     if (!selectors.contains(selector)) {
       selectors.add(selector);
       handleUnseenSelector(name, selector);
     }
   }
 
   void registerInvocation(SourceString methodName, Selector selector) {
     task.measure(() {
@@ skipping 86 matching lines @@
   void registerIsCheck(DartType type) {
     universe.isChecks.add(type);
   }
 
   void forEach(f(WorkItem work)) {
     while (!queue.isEmpty()) {
       f(queue.removeLast()); // TODO(kasperl): Why isn't this removeFirst?
     }
   }
 }