Fix language test that failed on mips hardware, because the created NaN happened

tests/language/nan_identical_test.dart

Index: tests/language/nan_identical_test.dart
diff --git a/tests/language/nan_identical_test.dart b/tests/language/nan_identical_test.dart
index 5f171be5c4c6ba6893663414bd65f82cbeb0239b..59a30bf8a12b8f7240ada7150734b26b9791b712 100644
--- a/tests/language/nan_identical_test.dart
+++ b/tests/language/nan_identical_test.dart
@@ -8,17 +8,14 @@ import 'dart:typed_data';
 
 import "package:expect/expect.dart";
 
-double uint64toDouble(int i) {
+double createOtherNAN() {
   var buffer = new Uint8List(8).buffer;
   var bdata = new ByteData.view(buffer);
-  bdata.setUint64(0, i);
+  bdata.setFloat64(0, double.NAN);
+  bdata.setInt8(0, bdata.getInt8(0) ^ 1);
   return bdata.getFloat64(0);

[rmacnak, 2016/03/23 22:12:11]

var result = bdata.getFloat64(0);
Expect.isTrue(result.isNaN);
return result;

[regis, 2016/03/23 22:42:59]

Done.

 }
 
-double createOtherNAN() {
-  return uint64toDouble((1 << 64) - 2);
-}
-
 main() {
   var otherNAN = createOtherNAN();
   for (int i = 0; i < 100; i++) {