Do not canonicalize Type instances.

sdk/lib/_internal/compiler/implementation/lib/interceptors.dart

Index: sdk/lib/_internal/compiler/implementation/lib/interceptors.dart
diff --git a/sdk/lib/_internal/compiler/implementation/lib/interceptors.dart b/sdk/lib/_internal/compiler/implementation/lib/interceptors.dart
index 63f4b4e008b709db9701802ebe74ed97815575b4..46d2977afd80102242b20e2bb6c1e941d8f22c1e 100644
--- a/sdk/lib/_internal/compiler/implementation/lib/interceptors.dart
+++ b/sdk/lib/_internal/compiler/implementation/lib/interceptors.dart
@@ -2,9 +2,9 @@
 // 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.
 
-#library('dart:_interceptors');
+library _interceptors;
 
-#import('dart:collection');
+import 'dart:collection';
 
 /**
  * The interceptor class for [String]. The compiler recognizes this
@@ -692,17 +692,17 @@ get$isOdd(receiver) {
 
 get$runtimeType(receiver) {
   if (receiver is int) {
-    return getOrCreateCachedRuntimeType('int');
+    return createRuntimeType('int');
   } else if (receiver is String) {
-    return getOrCreateCachedRuntimeType('String');
+    return createRuntimeType('String');
   } else if (receiver is double) {
-    return getOrCreateCachedRuntimeType('double');
+    return createRuntimeType('double');
   } else if (receiver is bool) {
-    return getOrCreateCachedRuntimeType('bool');
+    return createRuntimeType('bool');
   } else if (receiver == null) {
-    return getOrCreateCachedRuntimeType('Null');
+    return createRuntimeType('Null');
   } else if (isJsArray(receiver)) {
-    return getOrCreateCachedRuntimeType('List');
+    return createRuntimeType('List');
   } else {
     return UNINTERCEPTED(receiver.runtimeType);
   }