Merge more Kernel infrastructure from kernel_sdk SDK fork.

runtime/lib/integers_patch.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.
 // Dart core library.
 
 // VM implementation of int.
 
-import 'dart:_internal' as internal;
-
 @patch class int {
 
   @patch const factory int.fromEnvironment(String name,
                                            {int defaultValue})
       native "Integer_fromEnvironment";
 
 
   static int _tryParseSmi(String str, int first, int last) {
     assert(first <= last);
     var ix = first;
@@ skipping 184 matching lines @@
      6,  594823321,  12,  353814783205469041,
      6,  729000000,  12,  531441000000000000,  /* radix: 30 */
      6,  887503681,  12,  787662783788549761,
      6, 1073741824,  12, 1152921504606846976,
      5,   39135393,  12, 1667889514952984961,
      5,   45435424,  12, 2386420683693101056,
      5,   52521875,  12, 3379220508056640625,  /* radix: 35 */
      5,   60466176,  11,  131621703842267136,
   ];
 }