Avoid generating members for classes only for needed rti.

sdk/lib/_internal/compiler/implementation/js_emitter/class_emitter.dart

 // Copyright (c) 2013, 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 dart2js.js_emitter;
 
 class ClassEmitter extends CodeEmitterHelper {
   /**
    * Documentation wanted -- johnniwinther
    *
@@ skipping 17 matching lines @@
     String runtimeName =
         namer.getPrimitiveInterceptorRuntimeName(classElement);
 
     if (classElement.isMixinApplication) {
       String mixinName = namer.getNameOfClass(computeMixinClass(classElement));
       superName = '$superName+$mixinName';
       task.needsMixinSupport = true;
     }
 
     ClassBuilder builder = new ClassBuilder();
-    emitClassConstructor(classElement, builder, runtimeName);
+    if (!onlyForRti) {
+      emitClassConstructor(classElement, builder, runtimeName);
+    }
     emitFields(classElement, builder, superName, onlyForRti: onlyForRti);
-    emitClassGettersSetters(classElement, builder);
-    if (!classElement.isMixinApplication) {
-      emitInstanceMembers(classElement, builder);
+    if (!onlyForRti) {
+      emitClassGettersSetters(classElement, builder);
+      if (!classElement.isMixinApplication) {
+        emitInstanceMembers(classElement, builder);
+      }
     }
     task.typeTestEmitter.emitIsTests(classElement, builder);
 
     emitClassBuilderWithReflectionData(
         className, classElement, builder, buffer);
   }
 
   void emitClassConstructor(ClassElement classElement,
                             ClassBuilder builder,
                             String runtimeName) {
@@ skipping 166 matching lines @@
     if (hasMetadata) {
       fieldMetadata.insert(0, classDataNode);
       classDataNode = new jsAst.ArrayInitializer.from(fieldMetadata);
     }
     builder.addProperty('', classDataNode);
     return fieldsAdded;
   }
 
   void emitClassGettersSetters(ClassElement classElement,
                                ClassBuilder builder) {
-
     visitFields(classElement, false,
                 (VariableElement member,
                  String name,
                  String accessorName,
                  bool needsGetter,
                  bool needsSetter,
                  bool needsCheckedSetter) {
       compiler.withCurrentElement(member, () {
         if (needsCheckedSetter) {
           assert(!needsSetter);
@@ skipping 348 matching lines @@
         ? new Selector.getter(member.name, member.getLibrary())
         : new Selector.setter(member.name, member.getLibrary());
     String reflectionName = task.getReflectionName(selector, name);
     if (reflectionName != null) {
       var reflectable =
           js(backend.isAccessibleByReflection(member) ? '1' : '0');
       builder.addProperty('+$reflectionName', reflectable);
     }
   }
 }