Fixing bug introduced in r10210 that crashes v8 raytrace benchmark.

test/mjsunit/math-pow.js

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 122 matching lines @@
 
   assertEquals(+Infinity, Math.pow(-0, -0.5));
   assertEquals(+Infinity, Math.pow(-0, -0.6));
   assertEquals(-Infinity, Math.pow(-0, -1));
   assertEquals(-Infinity, Math.pow(-0, -10000000001));
 
   assertEquals(4, Math.pow(16, 0.5));
   assertEquals(NaN, Math.pow(-16, 0.5));
   assertEquals(0.25, Math.pow(16, -0.5));
   assertEquals(NaN, Math.pow(-16, -0.5));
+  
+  // Test detecting and converting integer value as double.
+  assertEquals(8, Math.pow(2, Math.sqrt(9)));
 
   // Tests from Mozilla 15.8.2.13.
   assertEquals(2, Math.pow.length);
   assertEquals(NaN, Math.pow());
   assertEquals(1, Math.pow(null, null));
   assertEquals(NaN, Math.pow(void 0, void 0));
   assertEquals(1, Math.pow(true, false));
   assertEquals(0, Math.pow(false, true));
   assertEquals(Infinity, Math.pow(-Infinity, Infinity));
   assertEquals(0, Math.pow(-Infinity, -Infinity));
   assertEquals(1, Math.pow(0, 0));
   assertEquals(0, Math.pow(0, Infinity));
   assertEquals(NaN, Math.pow(NaN, 0.5));
   assertEquals(NaN, Math.pow(NaN, -0.5));
 
   // Tests from Sputnik S8.5_A13_T1.
   assertTrue(
       (1*((Math.pow(2,53))-1)*(Math.pow(2,-1074))) === 4.4501477170144023e-308);
   assertTrue(
       (1*(Math.pow(2,52))*(Math.pow(2,-1074))) === 2.2250738585072014e-308);
   assertTrue(
       (-1*(Math.pow(2,52))*(Math.pow(2,-1074))) === -2.2250738585072014e-308);
 }
 
 test();
 test();
 %OptimizeFunctionOnNextCall(test);
 test();