Allow private selectors to be typed, and fix ClassElement.isSubclassOf to take patches into account.

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 1542 matching lines @@
       registerGetter(node);
     } else if (selector.isSetter()) {
       registerSetter(node);
     } else {
       registerMethodInvoke(node);
     }
   }
 
   Selector getOptimizedSelectorFor(HInvokeDynamic node,
                                    Selector defaultSelector) {
-    // TODO(4434): For private members we need to use the untyped selector.
-    if (defaultSelector.name.isPrivate()) return defaultSelector;
     // TODO(ngeoffray): Type intercepted calls.
     if (node.isInterceptorCall) return defaultSelector;
     // 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) {
       return defaultSelector;
     }
     HType receiverHType = types[node.inputs[0]];
     DartType receiverType = receiverHType.computeType(compiler);
@@ skipping 1428 matching lines @@
   if (leftType.canBeNull() && rightType.canBeNull()) {
     if (left.isConstantNull() || right.isConstantNull() ||
         (leftType.isPrimitive() && leftType == rightType)) {
       return '==';
     }
     return null;
   } else {
     return '===';
   }
 }