Less inequivalence on Hello World!

pkg/compiler/lib/src/js_emitter/startup_emitter/emitter.dart

 // Copyright (c) 2015, 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.startup_emitter;
 
 import 'package:js_runtime/shared/embedded_names.dart'
     show JsBuiltin, METADATA, STATIC_FUNCTION_NAME_TO_CLOSURE, TYPES;
 
 import '../../common.dart';
@@ skipping 37 matching lines @@
 
   Emitter(this._compiler, this.namer, NativeEmitter nativeEmitter,
       this._closedWorld, CodeEmitterTask task, bool shouldGenerateSourceMap)
       : _emitter = new ModelEmitter(_compiler, namer, nativeEmitter,
             _closedWorld, task, shouldGenerateSourceMap);
 
   DiagnosticReporter get reporter => _compiler.reporter;
 
   @override
   int emitProgram(ProgramBuilder programBuilder) {
-    Program program = programBuilder.buildProgram();
+    Program program = programForTesting = programBuilder.buildProgram();
     return _emitter.emitProgram(program);
   }
 
   @override
   bool isConstantInlinedOrAlreadyEmitted(ConstantValue constant) {
     return _emitter.isConstantInlinedOrAlreadyEmitted(constant);
   }
 
   @override
   int compareConstants(ConstantValue a, ConstantValue b) {
@@ skipping 92 matching lines @@
     }
   }
 
   @override
   int generatedSize(OutputUnit unit) {
     Fragment key = _emitter.outputBuffers.keys
         .firstWhere((Fragment fragment) => fragment.outputUnit == unit);
     return _emitter.outputBuffers[key].length;
   }
 }