Remove int.pow and double.pow from VM library.

runtime/lib/math_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.
 
 import "dart:typed_data";
 
 // A VM patch of the dart:math library.
 
 // If [x] is an [int] and [exponent] is a non-negative [int], the result is
 // an [int], otherwise the result is a [double].
 patch num pow(num x, num exponent) {
   if ((x is int) && (exponent is int) && (exponent >= 0)) {
-    return x.pow(exponent);
+    return _intPow(x, exponent);
   }
-  // Double.pow will call exponent.toDouble().
-  return x.toDouble().pow(exponent);
+  // doublePow will call exponent.toDouble().
+  return _doublePow(x.toDouble(), exponent);
+}
+
+double _doublePow(double base, num exponent) {
+  if (exponent == 0) {
+    return 1.0;  // ECMA-262 15.8.2.13
+  }
+  if (exponent is! num) {
+    throw new ArgumentError(null);
+  }
+  double doubleExponent = exponent.toDouble();
+  if (base.isNaN || exponent.isNaN) {
+    return double.NAN;
+  }
+  return _pow(base, doubleExponent);
+}
+
+double _pow(double base, double exponent) native "Math_doublePow";
+
+int _intPow(int base, int exponent) {
+  // Exponentiation by squaring.
+  int result = 1;
+  while (exponent != 0) {
+    if ((exponent & 1) == 1) {
+      result *= base;
+    }
+    exponent >>= 1;
+    // Skip unnecessary operation (can overflow to Mint or Bigint).
+    if (exponent != 0) {
+      base *= base;
+    }
+  }
+  return result;
 }
 
 patch double atan2(num a, num b) => _atan2(a.toDouble(), b.toDouble());
 patch double sin(num value) => _sin(value.toDouble());
 patch double cos(num value) => _cos(value.toDouble());
 patch double tan(num value) => _tan(value.toDouble());
 patch double acos(num value) => _acos(value.toDouble());
 patch double asin(num value) => _asin(value.toDouble());
 patch double atan(num value) => _atan(value.toDouble());
 patch double sqrt(num value) => _sqrt(value.toDouble());
@@ skipping 104 matching lines @@
   static int _nextSeed() {
     if (_prng == null) {
       // TODO(iposva): Use system to get a random seed.
       _prng = new Random(new DateTime.now().millisecondsSinceEpoch);
     }
     // Trigger the PRNG once to change the internal state.
     _prng._nextState();
     return _prng._state[kSTATE_LO];
   }
 }