Change type of multiplier to int, not _Smi.

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.
 
 patch class int {
 
   /* patch */ const factory int.fromEnvironment(String name,
@@ skipping 116 matching lines @@
     int smallBlockSize = length;
     while (smallBlockSize >= blockSize) smallBlockSize -= blockSize;
     int result = 0;
     if (smallBlockSize > 0) {
       int blockEnd = start + smallBlockSize;
       _Smi smi = _parseBlock(source, radix, start, blockEnd);
       if (smi == null) return null;
       result = sign * smi;
       start = blockEnd;
     }
-    _Smi multiplier = _PARSE_LIMITS[tableIndex + 1];
+    int multiplier = _PARSE_LIMITS[tableIndex + 1];
     int blockEnd = start + blockSize;
     do {
       _Smi smi = _parseBlock(source, radix, start, blockEnd);
       if (smi == null) return null;
       result = (result * multiplier) + (sign * smi);
       start = blockEnd;
       blockEnd = start + blockSize;
     } while (blockEnd <= end);
     return result;
   }
@@ skipping 55 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,
   ];
 }