Fix 2 host-checked error with the enqueuer:

sdk/lib/_internal/compiler/implementation/ssa/codegen.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 ssa;
 
 class SsaCodeGeneratorTask extends CompilerTask {
 
   final JavaScriptBackend backend;
 
@@ skipping 1512 matching lines @@
       registerGetter(node);
     } else if (selector.isSetter()) {
       registerSetter(node);
     } else {
       registerMethodInvoke(node);
     }
     backend.registerUseInterceptor(world);
   }
 
   Selector getOptimizedSelectorFor(HInvokeDynamic node, Selector selector) {
+    if (node.element != null) {
+      // Create an artificial type mask to make sure only
+      // [node.element] will be enqueued. We're not using the receiver
+      // type because our optimizations might end up in a state where the
+      // invoke dynamic knows more than the receiver.
+      HType receiverType = new HType.fromMask(
+          new TypeMask.nonNullExact(node.element.getEnclosingClass().rawType),
+          compiler);
+      return receiverType.refine(selector, compiler);
+    }
     // If [JSInvocationMirror._invokeOn] has been called, we must not create a
     // typed selector based on the receiver type.
-    if (node.element == null && // Invocation is not exact.
-        backend.compiler.enabledInvokeOn) {
+    if (backend.compiler.enabledInvokeOn) {
       return selector.asUntyped;
     }
     HType receiverType = node.getDartReceiver(compiler).instructionType;
     return receiverType.refine(selector, compiler);
   }
 
   void registerInvoke(HInvokeDynamic node, Selector selector) {
     if (node.isInterceptedCall) {
       backend.addInterceptedSelector(selector);
     }
@@ skipping 1456 matching lines @@
   if (leftType.canBeNull() && rightType.canBeNull()) {
     if (left.isConstantNull() || right.isConstantNull() ||
         (leftType.isPrimitive() && leftType == rightType)) {
       return '==';
     }
     return null;
   } else {
     return '===';
   }
 }