fix some errors in our SDK, mostly around numbers

lib/runtime/dart_runtime.js

 // Copyright (c) 2015, 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.
 
 dart_library.library('dart_runtime/dart', null, /* Imports */[
   'dart_runtime/_classes',
   'dart_runtime/_errors',
   'dart_runtime/_generators',
   'dart_runtime/_operations',
   'dart_runtime/_rtti',
@@ skipping 56 matching lines @@
   exportFrom(dart_utils, ['copyProperties', 'export']);
   // Renames
   exports.defineLazyClass = _export(dart_utils.defineLazy);
   exports.defineLazyProperties = _export(dart_utils.defineLazy);
   exports.defineLazyClassGeneric = _export(dart_utils.defineLazyProperty);
 
   // From operations
   exportFrom(operations, [
     'JsIterator',
     'arity',
+    'asInt',
     'assert',
     'const',
     'dcall',
     'dindex',
     'dload',
     'dput',
     'dsend',
     'dsetindex',
     'equals',
     'hashCode',
@@ skipping 24 matching lines @@
   ]);
 
   // From rtti
   exportFrom(rtti, [
     'fn',
     'realRuntimeType',
     'runtimeType',
   ]);
 
 });