Move core and coreimpl from corelib/ to lib/core and lib/coreimpl.

corelib/src/implementation/object.dart

Index: corelib/src/implementation/object.dart
diff --git a/corelib/src/implementation/object.dart b/corelib/src/implementation/object.dart
deleted file mode 100644
index 9ef1fb92b40d787e1043de292dab11f80e8f31b6..0000000000000000000000000000000000000000
--- a/corelib/src/implementation/object.dart
+++ /dev/null
@@ -1,8 +0,0 @@
-// 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.
-
-class ObjectImplementation {
-  external static String toStringImpl(Object o);
-  external static void noSuchMethodImpl(Object o, String name, List args);
-}