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

lib/compiler/implementation/world.dart

Index: lib/compiler/implementation/world.dart
diff --git a/lib/compiler/implementation/world.dart b/lib/compiler/implementation/world.dart
index 0e6410a37301324a3abb98dbcf030834bae144e8..4ff3eb388806e7dc0014b3cbaced68b2a823bdd8 100644
--- a/lib/compiler/implementation/world.dart
+++ b/lib/compiler/implementation/world.dart
@@ -72,7 +72,9 @@ class World {
     }
   }
 
-  bool needsRti(ClassElement cls) => classesNeedingRti.contains(cls);
+  bool needsRti(ClassElement cls) {
+    return classesNeedingRti.contains(cls) || compiler.enabledRuntimeType;

[ngeoffray, 2012/09/17 15:31:14]

Ouch. Is it there that you should also check which types are instantiated?
Please add a TODO.

Also, do you plan on cutting the number of classes needing rti by using the type
information at the ssa level of the receiver of dynamicType?

[karlklose, 2012/09/19 06:40:45]

No, I don't think we need to check that here. Currently we simply need the type
arguments to construct the runtime type string representation.

+  }
 
   void registerRtiDependency(Element element, Element dependency) {
     // We're not dealing with typedef for now.