Add CoreClasses

pkg/compiler/lib/src/js_emitter/full_emitter/class_emitter.dart

Index: pkg/compiler/lib/src/js_emitter/full_emitter/class_emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/full_emitter/class_emitter.dart b/pkg/compiler/lib/src/js_emitter/full_emitter/class_emitter.dart
index cb03c3e0ef794509a702fe915b4661c99e6ac7c7..5852aa4fde5be391e114fe252e91e5f1e6b89822 100644
--- a/pkg/compiler/lib/src/js_emitter/full_emitter/class_emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/full_emitter/class_emitter.dart
@@ -253,8 +253,7 @@ class ClassEmitter extends CodeEmitterHelper {
       emitter.containerBuilder.addMemberMethod(method, builder);
     }
 
-    if (identical(classElement, compiler.objectClass)
-        && backend.enabledNoSuchMethod) {
+    if (classElement.isObject && backend.enabledNoSuchMethod) {
       // Emit the noSuchMethod handlers on the Object prototype now,
       // so that the code in the dynamicFunction helper can find
       // them. Note that this helper is invoked before analyzing the