dart2js: Split TypeTestEmitter into a registry and an emitter.

pkg/compiler/lib/src/js_emitter/program_builder.dart

 // Copyright (c) 2014, 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.
 
 library dart2js.js_emitter.program_builder;
 
 import 'js_emitter.dart' show computeMixinClass;
 import 'model.dart';
 
 import '../common.dart';
@@ skipping 252 matching lines @@
     ClassElement implementation = element.implementation;
 
     // MixinApplications run through the members of their mixin. Here, we are
     // only interested in direct members.
     if (!element.isMixinApplication) {
       implementation.forEachMember(visitMember, includeBackendMembers: true);
     }
     String name = namer.getNameOfClass(element);
     String holderName = namer.globalObjectFor(element);
     Holder holder = _registry.registerHolder(holderName);
-    bool onlyForRti =
-        _task.typeTestEmitter.rtiNeededClasses.contains(element);
+    bool onlyForRti = _task.typeTestRegistry.rtiNeededClasses.contains(element);
     bool isInstantiated =
         _compiler.codegenWorld.directlyInstantiatedClasses.contains(element);
 
     Class result;
     if (element.isMixinApplication) {
       assert(methods.isEmpty);
       assert(fields.isEmpty);
       result = new MixinApplication(name, holder,
                                     isDirectlyInstantiated: isInstantiated,
                                     onlyForRti: onlyForRti);
@@ skipping 133 matching lines @@
     for (ConstantValue constantValue in constantValues) {
       assert(!_constants.containsKey(constantValue));
       String name = namer.constantName(constantValue);
       String constantObject = namer.globalObjectForConstant(constantValue);
       Holder holder = _registry.registerHolder(constantObject);
       Constant constant = new Constant(name, holder, constantValue);
       _constants[constantValue] = constant;
     };
   }
 }