Couple of backend fixes:

sdk/lib/_internal/compiler/implementation/js_backend/backend.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.
 
 part of js_backend;
 
 class JavaScriptItemCompilationContext extends ItemCompilationContext {
   final Set<HInstruction> boundsChecked;
 
   JavaScriptItemCompilationContext()
@@ skipping 351 matching lines @@
   static Namer determineNamer(Compiler compiler) {
     return compiler.enableMinification ?
         new MinifyNamer(compiler) :
         new Namer(compiler);
   }
 
   bool canBeUsedForGlobalOptimizations(Element element) {
     if (element.isParameter()
         || element.isFieldParameter()
         || element.isField()) {
-      element = element.enclosingElement;
+      if (!canBeUsedForGlobalOptimizations(element.enclosingElement)) {
+        return false;
+      }
     }
     element = element.declaration;
     return !isNeededForReflection(element) && !helpersUsed.contains(element);
   }
 
   bool isInterceptorClass(ClassElement element) {
     if (element == null) return false;
     if (Elements.isNativeOrExtendsNative(element)) return true;
     if (interceptedClasses.contains(element)) return true;
     if (classesMixedIntoNativeClasses.contains(element)) return true;
@@ skipping 564 matching lines @@
   void registerAbstractClassInstantiation(TreeElements elements) {
     enqueueInResolution(getThrowAbstractClassInstantiationError(), elements);
     // Also register the types of the arguments passed to this method.
     enqueueClass(compiler.enqueuer.resolution, compiler.stringClass, elements);
   }
 
   void registerFallThroughError(TreeElements elements) {
     enqueueInResolution(getFallThroughError(), elements);
   }
 
+  void enableNoSuchMethod(Enqueuer world) {
+    enqueue(world, getCreateInvocationMirror(), compiler.globalDependencies);
+    world.registerInvocation(compiler.noSuchMethodSelector);
+  }
+
   void registerSuperNoSuchMethod(TreeElements elements) {
     enqueueInResolution(getCreateInvocationMirror(), elements);
     enqueueInResolution(
         compiler.objectClass.lookupLocalMember(Compiler.NO_SUCH_METHOD),
         elements);
     enqueueClass(compiler.enqueuer.resolution, compiler.listClass, elements);
   }
 
   void registerRequiredType(DartType type, Element enclosingElement) {
     /**
@@ skipping 723 matching lines @@
     copy(constant.values);
     copy(constant.protoValue);
     copy(constant);
   }
 
   void visitConstructed(ConstructedConstant constant) {
     copy(constant.fields);
     copy(constant);
   }
 }