dart2js cps: 'is' checks on types with type arguments.

pkg/compiler/lib/src/tree_ir/tree_ir_builder.dart

Index: pkg/compiler/lib/src/tree_ir/tree_ir_builder.dart
diff --git a/pkg/compiler/lib/src/tree_ir/tree_ir_builder.dart b/pkg/compiler/lib/src/tree_ir/tree_ir_builder.dart
index a8ede5cef1cd67e216989af369e0f2a46407110b..980aefbc7315e056c3016181c683fa9cdeabcd0a 100644
--- a/pkg/compiler/lib/src/tree_ir/tree_ir_builder.dart
+++ b/pkg/compiler/lib/src/tree_ir/tree_ir_builder.dart
@@ -511,9 +511,11 @@ class Builder implements cps_ir.Visitor<Node> {
   }
 
   Statement visitTypeOperator(cps_ir.TypeOperator node) {
-    Expression receiver = getVariableUse(node.receiver);
+    Expression value = getVariableUse(node.value);
+    List<Expression> typeArgs = translateArguments(node.typeArguments);
     Expression concat =
-        new TypeOperator(receiver, node.type, isTypeTest: node.isTypeTest);
+        new TypeOperator(value, node.type, typeArgs,
+                         isTypeTest: node.isTypeTest);
     return continueWithExpression(node.continuation, concat);
   }