[tests] Make assertOptimized()/assertUnoptimized() great again.

test/mjsunit/regress/regress-4121.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --allow-natives-syntax
 
 function literals_sharing_test(warmup, optimize) {
   function closure() {
     // Ensure small array literals start in specific element kind mode.
     assertTrue(%HasFastSmiElements([]));
@@ skipping 24 matching lines @@
     literals_sharing_test(warmup, false);
     warmup = false;
   }
   print("iter: " + i + ", opt: true");
   literals_sharing_test(warmup, true);
 }
 
 
 function stress_opt_test() {}
 stress_opt_test();
-if (%GetOptimizationStatus(stress_opt_test) == 2) {
+var opt_status = %GetOptimizationStatus(stress_opt_test);
+if ((opt_status & V8OptimizationStatus.kAlwaysOptimize) === 0) {
   // This test is not suitable for --always-opt mode.
   test();
 }