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

pkg/compiler/lib/src/cps_ir/cps_ir_tracer.dart

Index: pkg/compiler/lib/src/cps_ir/cps_ir_tracer.dart
diff --git a/pkg/compiler/lib/src/cps_ir/cps_ir_tracer.dart b/pkg/compiler/lib/src/cps_ir/cps_ir_tracer.dart
index 30fc6c3ba7ff0a20d96ea84ce919143d35baaaf8..23e6b3bb7f45476018d3bb2af97c162a6901d17e 100644
--- a/pkg/compiler/lib/src/cps_ir/cps_ir_tracer.dart
+++ b/pkg/compiler/lib/src/cps_ir/cps_ir_tracer.dart
@@ -273,10 +273,10 @@ class IRTracer extends TracerUtil implements cps_ir.Visitor {
     return 'CreateBox';
   }
 
-  visitCreateClosureClass(cps_ir.CreateClosureClass node) {
+  visitCreateInstance(cps_ir.CreateInstance node) {
     String className = node.classElement.name;
     String arguments = node.arguments.map(formatReference).join(', ');
-    return 'CreateClosureClass $className ($arguments)';
+    return 'CreateInstance $className ($arguments)';
   }
 
   visitIdentical(cps_ir.Identical node) {