Move js library back into compiler directory.

sdk/lib/_internal/lib/annotations.dart

Index: sdk/lib/_internal/lib/annotations.dart
diff --git a/sdk/lib/_internal/lib/annotations.dart b/sdk/lib/_internal/lib/annotations.dart
deleted file mode 100644
index 1e63cf99a61c7774b6d5735ea8915acc36ed0e16..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/lib/annotations.dart
+++ /dev/null
@@ -1,36 +0,0 @@
-// 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 _js_helper;
-
-/// Tells the optimizing compiler that the annotated method has no
-/// side-effects.
-/// Requires @NoInline() to function correctly.
-class NoSideEffects {
-  const NoSideEffects();
-}
-
-/// Tells the optimizing compiler that the annotated method cannot throw.
-/// Requires @NoInline() to function correctly.
-class NoThrows {
-  const NoThrows();
-}
-
-/// Tells the optimizing compiler to not inline the annotated method.
-class NoInline {
-  const NoInline();
-}
-
-// Ensures that the annotated method is represented internally using
-// IR nodes ([:value == true:]) or AST nodes ([:value == false:]).
-class IrRepresentation {
-  final bool value;
-  const IrRepresentation(this.value);
-}
-
-/// Marks a class as native and defines its JavaScript name(s).
-class Native {
-  final String name;
-  const Native(this.name);
-}