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

pkg/compiler/lib/src/js_emitter/old_emitter/type_test_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 TypeTestEmitter extends CodeEmitterHelper {
   static const int MAX_FUNCTION_TYPE_PREDICATES = 10;
 
   /**
@@ skipping 428 matching lines @@
     checkedFunctionTypes = new Set<FunctionType>();
     compiler.codegenWorld.isChecks.forEach((DartType t) {
       if (t is InterfaceType) {
         checkedClasses.add(t.element);
       } else if (t is FunctionType) {
         checkedFunctionTypes.add(t);
       }
     });
   }
 }