Move dart2js from sdk/lib/_internal/compiler to pkg/compiler

pkg/compiler/lib/src/js_emitter/class_stub_generator.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.
 
 part of dart2js.js_emitter;
 
 class ClassStubGenerator {
   final Namer namer;
   final Compiler compiler;
   final JavaScriptBackend backend;
@@ skipping 23 matching lines @@
 
   jsAst.Expression generateSetter(Element member, String fieldName) {
     ClassElement cls = member.enclosingClass;
     String receiver = backend.isInterceptorClass(cls) ? 'receiver' : 'this';
     List<String> args = backend.isInterceptedMethod(member) ? ['receiver'] : [];
     // TODO(floitsch): remove 'return'?
     return js('function(#, v) { return #.# = v; }',
         [args, receiver, fieldName]);
   }
 }