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

pkg/compiler/lib/src/inferrer/concrete_types_inferrer.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.
 
 library concrete_types_inferrer;
 
 import 'dart:collection' show Queue, IterableBase;
 import '../native/native.dart' as native;
 import '../dart2jslib.dart' hide Selector, TypedSelector;
 import '../dart_types.dart' show DartType, TypeKind;
@@ skipping 2361 matching lines @@
       if (element is Local) {
         ConcreteType type = locals.use(element);
         if (type != null) {
           inferrer.augmentInferredType(node, type);
         }
       }
     }
     return super.visitGetterSend(node);
   }
 }