Fixing bug introduced in r10210 that crashes v8 raytrace benchmark.

test/mjsunit/math-pow.js

Index: test/mjsunit/math-pow.js
diff --git a/test/mjsunit/math-pow.js b/test/mjsunit/math-pow.js
index 535588dbd1f3d5c5cad090576c304bde42243e79..174065a70c560dc1bb50898667a5657038517049 100644
--- a/test/mjsunit/math-pow.js
+++ b/test/mjsunit/math-pow.js
@@ -140,6 +140,9 @@ function test() {
   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);