Re-apply "Clean up the patch file for the isolate library by introducing a new buitlin library: iso…

sdk/lib/_internal/libraries.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 libraries;
 
 /**
  * A bit flag used by [LibraryInfo] indicating that a library is used by dart2js
  */
 const int DART2JS_PLATFORM = 1;
@@ skipping 97 matching lines @@
       "_internal/compiler/implementation/lib/interceptors.dart",
       category: "Internal",
       documented: false,
       platforms: DART2JS_PLATFORM),
 
   "_foreign_helper": const LibraryInfo(
       "_internal/compiler/implementation/lib/foreign_helper.dart",
       category: "Internal",
       documented: false,
       platforms: DART2JS_PLATFORM),
+
+  "_isolate_helper": const LibraryInfo(
+      "_internal/compiler/implementation/lib/isolate_helper.dart",
+      category: "Internal",
+      documented: false,
+      platforms: DART2JS_PLATFORM),
 };
 
 /**
  * Information about a "dart:" library.
  */
 class LibraryInfo {
 
   /**
    * Path to the library's *.dart file relative to this file.
    */
@@ skipping 43 matching lines @@
                     this.category: "Shared",
                     this.dart2jsPath,
                     this.dart2jsPatchPath,
                     this.implementation: false,
                     this.documented: true,
                     this.platforms: DART2JS_PLATFORM | VM_PLATFORM});
 
   bool get isDart2jsLibrary => (platforms & DART2JS_PLATFORM) != 0;
   bool get isVmLibrary => (platforms & VM_PLATFORM) != 0;
 }