VM: Improve and fix double negation on MIPS.

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 b4bba9aae148fcaae9489247a42e5ccc08356f50..a567f8021b94f4e1ca135ad11dbb7cc8b7a4b84c 100644
--- a/tests/language/nan_identical_test.dart
+++ b/tests/language/nan_identical_test.dart
@@ -2,7 +2,7 @@
 // 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.
 // Test a new statement by itself.
-// VMOptions=--optimization-counter-threshold=4 --no-use-osr
+// VMOptions=--optimization-counter-threshold=4
 
 import 'dart:typed_data';
 
@@ -48,4 +48,4 @@ main() {
   }
 }
 
-checkIdentical(a, b) => identical(a, b);
+checkIdentical(a, b) => identical(a, b);