Use memory compiler in compiler_helper.dart.

pkg/compiler/lib/src/js_backend/backend.dart

 // Copyright (c) 2012, 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 js_backend;
 
 const VERBOSE_OPTIMIZER_HINTS = false;
 
 class JavaScriptItemCompilationContext extends ItemCompilationContext {
   final Set<HInstruction> boundsChecked = new Set<HInstruction>();
@@ skipping 1483 matching lines @@
   ClassElement defaultSuperclass(ClassElement element) {
     // Native classes inherit from Interceptor.
     return element.isNative ? jsInterceptorClass : compiler.objectClass;
   }
 
   /**
    * Unit test hook that returns code of an element as a String.
    *
    * Invariant: [element] must be a declaration element.
    */
-  String assembleCode(Element element) {
+  String getGeneratedCode(Element element) {
     assert(invariant(element, element.isDeclaration));
-    var code = generatedCode[element];
-    if (namer is jsAst.TokenFinalizer) {
-      jsAst.TokenCounter counter = new jsAst.TokenCounter();
-      counter.countTokens(code);
-      // Avoid a warning.
-      var finalizer = namer;
-      finalizer.finalizeTokens();
-    }
     return jsAst.prettyPrint(generatedCode[element], compiler).getText();
   }
 
   int assembleProgram() {
     int programSize = emitter.assembleProgram();
     noSuchMethodRegistry.emitDiagnostic();
     int totalMethodCount = generatedCode.length;
     if (totalMethodCount != preMirrorsMethodCount) {
       int mirrorCount = totalMethodCount - preMirrorsMethodCount;
       double percentage = (mirrorCount / totalMethodCount) * 100;
@@ skipping 1610 matching lines @@
   }
 }
 
 /// Records that [constant] is used by the element behind [registry].
 class Dependency {
   final ConstantValue constant;
   final Element annotatedElement;
 
   const Dependency(this.constant, this.annotatedElement);
 }