Fix for Issue 8460.

sdk/lib/_internal/compiler/implementation/ssa/builder.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;
 
 /**
  * A special element for the extra parameter taken by intercepted
  * methods. We need to override [Element.computeType] because our
  * optimizers may look at its declared type.
@@ skipping 2992 matching lines @@
     if (!node.arguments.isEmpty) {
       compiler.cancel('Too many arguments',
                       node: node.argumentsNode);
     }
     String constructorName = backend.namer.isolateName;
     push(new HForeign(new DartString.literal("new $constructorName"),
                       HType.UNKNOWN,
                       <HInstruction>[]));
   }
 
+  void handleForeignDartObjectJsConstructorFunction(Send node) {
+    if (!node.arguments.isEmpty) {
+      compiler.cancel('Too many arguments', node: node.argumentsNode);
+    }
+    String jsClassReference = backend.namer.isolateAccess(compiler.objectClass);
+    push(new HForeign(new DartString.literal(jsClassReference),
+                      HType.UNKNOWN,
+                      <HInstruction>[]));
+  }
+
   visitForeignSend(Send node) {
     Selector selector = elements.getSelector(node);
     SourceString name = selector.name;
     if (name == const SourceString('JS')) {
       handleForeignJs(node);
     } else if (name == const SourceString('JS_CURRENT_ISOLATE')) {
       handleForeignJsCurrentIsolate(node);
     } else if (name == const SourceString('JS_CALL_IN_ISOLATE')) {
       handleForeignJsCallInIsolate(node);
     } else if (name == const SourceString('DART_CLOSURE_TO_JS')) {
       handleForeignDartClosureToJs(node, 'DART_CLOSURE_TO_JS');
     } else if (name == const SourceString('RAW_DART_FUNCTION_REF')) {
       handleForeignRawFunctionRef(node, 'RAW_DART_FUNCTION_REF');
     } else if (name == const SourceString('JS_SET_CURRENT_ISOLATE')) {
       handleForeignSetCurrentIsolate(node);
     } else if (name == const SourceString('JS_CREATE_ISOLATE')) {
       handleForeignCreateIsolate(node);
     } else if (name == const SourceString('JS_OPERATOR_IS_PREFIX')) {
       stack.add(addConstantString(node, backend.namer.operatorIsPrefix()));
     } else if (name == const SourceString('JS_OPERATOR_AS_PREFIX')) {
       stack.add(addConstantString(node, backend.namer.operatorAsPrefix()));
+    } else if (name == const SourceString('JS_DART_OBJECT_CONSTRUCTOR')) {
+      handleForeignDartObjectJsConstructorFunction(node);
     } else {
       throw "Unknown foreign: ${selector}";
     }
   }
 
   generateSuperNoSuchMethodSend(Send node) {
     Selector selector = elements.getSelector(node);
     SourceString name = selector.name;
 
     ClassElement cls = currentElement.getEnclosingClass();
@@ skipping 2020 matching lines @@
           new HSubGraphBlockInformation(elseBranch.graph));
 
     HBasicBlock conditionStartBlock = conditionBranch.block;
     conditionStartBlock.setBlockFlow(info, joinBlock);
     SubGraph conditionGraph = conditionBranch.graph;
     HIf branch = conditionGraph.end.last;
     assert(branch is HIf);
     branch.blockInformation = conditionStartBlock.blockFlow;
   }
 }