Implement constructor bodies and initializers in CPS->JS backend.

pkg/compiler/lib/src/js_backend/codegen/unsugar.dart

 library dart2js.unsugar_cps;
 
 import '../../cps_ir/cps_ir_nodes.dart';
 
 // TODO(karlklose): share the [ParentVisitor].
 import '../../cps_ir/optimizers.dart';
 import '../../constants/expressions.dart';
 import '../../constants/values.dart';
 import '../../elements/elements.dart' show ClassElement, FieldElement;
 import '../../js_backend/codegen/glue.dart';
@@ skipping 55 matching lines @@
     node.arguments.insert(0, node.receiver);
     node.receiver = new Reference<Primitive>(intercepted);
   }
 
   Primitive makeNull() {
     NullConstantValue nullConst = new NullConstantValue();
     return new Constant(new PrimitiveConstantExpression(nullConst));
   }
 
   processInvokeMethodDirectly(InvokeMethodDirectly node) {
-    if (_glue.isInterceptedSelector(node.selector)) {
+    if (_glue.isInterceptedMethod(node.target)) {
       Primitive nullPrim = makeNull();
       insertLetPrim(nullPrim, node);
       node.arguments.insert(0, node.receiver);
       node.receiver = new Reference<Primitive>(nullPrim);
     }
   }
 
   processBranch(Branch node) {
     // TODO(karlklose): implement the checked mode part of boolean conversion.
     InteriorNode parent = node.parent;
     IsTrue condition = node.condition;
     Primitive t = trueConstant;
     Primitive i = new Identical(condition.value.definition, t);
     LetPrim newNode = new LetPrim(t,
         new LetPrim(i,
             new Branch(new IsTrue(i),
                 node.trueContinuation.definition,
                 node.falseContinuation.definition)));
     condition.value.unlink();
     node.trueContinuation.unlink();
     node.falseContinuation.unlink();
     parent.body = newNode;
   }
 }