Fix for issue 10534. Implement int.pow correctly. Note that int.pow is considerably slower than dou…

tests/standalone/pow_test.dart

 // 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.
 //
 // Dart test program for testing math's pow.
 
 library pow_test;
 
 import "package:expect/expect.dart";
 import 'dart:math';
@@ skipping 67 matching lines @@
   18446744073709551616,
   36893488147419103232,
   73786976294838206464,
   147573952589676412928
 ];
 
 
 void main() {
   int exp = 0;
   for (int val in expectedResults) {
-    Expect.equals(val, pow(2, exp++));
+    Expect.equals(val, pow(2, exp));
+    Expect.equals(val.toDouble(), pow(2, exp.toDouble()));
+    exp++;
   }
+
   // Optimize it.
   for (int i = 0; i < 8888; i++) {
     pow(2, 3);
+    pow(2.0, 3.0);
   }
   exp = 0;
   for (int val in expectedResults) {
-    Expect.equals(val, pow(2, exp++));
+    Expect.equals(val, pow(2, exp));
+    Expect.equals(val.toDouble(), pow(2, exp.toDouble()));
+    exp++;
   }
+  // Test Bigints.
+  Expect.equals(5559917313492231481, pow(11, 18));
+  Expect.equals(672749994932560009201, pow(11, 20));
 }