Couple of backend fixes:

sdk/lib/_internal/compiler/implementation/js_backend/backend.dart

Index: sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
===================================================================
--- sdk/lib/_internal/compiler/implementation/js_backend/backend.dart	(revision 26986)
+++ sdk/lib/_internal/compiler/implementation/js_backend/backend.dart	(working copy)
@@ -369,7 +369,9 @@
     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);
@@ -954,6 +956,11 @@
     enqueueInResolution(getFallThroughError(), elements);
   }
 
+  void enableNoSuchMethod(Enqueuer world) {
+    enqueue(world, getCreateInvocationMirror(), compiler.globalDependencies);
+    world.registerInvocation(compiler.noSuchMethodSelector);
+  }
+
   void registerSuperNoSuchMethod(TreeElements elements) {
     enqueueInResolution(getCreateInvocationMirror(), elements);
     enqueueInResolution(