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

pkg/compiler/lib/src/js_emitter/old_emitter/nsm_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 NsmEmitter extends CodeEmitterHelper {
   final List<Selector> trivialNsmHandlers = <Selector>[];
 
   /// If this is true then we can generate the noSuchMethod handlers at startup
@@ skipping 368 matching lines @@
           noSuchMethodName,
           createInvocationMirror,
           sliceOffsetParams,  // argument to slice
           minify ? 'shortNames' : 'longNames',
           sliceOffsetArguments
       ]));
 
     return statements;
   }
 }