Increase precision for base conversion for large integers.

test/mjsunit/regress/regress-3025.js

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-// Test that we can create arrays of any size.
-for (var i = 1000; i < 1000000; i += 197) {
-  new Array(i);
-}
+var n = 0x8000000000000800;
+assertEquals(n, 9223372036854778000);
+var s = n.toString(5);
+var v = parseInt(s, 5);
+assertEquals(n, v);