Do not (eagerly) trigger exception in mjsunit.js.

test/mjsunit/mjsunit.js

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 353 matching lines @@
 
   assertUnreachable = function assertUnreachable(name_opt) {
     // Fix this when we ditch the old test runner.
     var message = "Fail" + "ure: unreachable";
     if (name_opt) {
       message += " - " + name_opt;
     }
     throw new MjsUnitAssertionError(message);
   };
 
-
-  var OptimizationStatus;
-  try {
-    OptimizationStatus =
-      new Function("fun", "sync", "return %GetOptimizationStatus(fun, sync);");
-  } catch (e) {
-    OptimizationStatus = function() {
+  var OptimizationStatus = function(fun, sync_opt) {
+    try {
+      return eval("%GetOptimizationStatus(fun, sync_opt);");
+    } catch (e) {
       throw new Error("natives syntax not allowed");
     }
   }
 
   assertUnoptimized = function assertUnoptimized(fun, sync_opt, name_opt) {
     if (sync_opt === undefined) sync_opt = "";
     assertTrue(OptimizationStatus(fun, sync_opt) != 1, name_opt);
   }
 
   assertOptimized = function assertOptimized(fun, sync_opt, name_opt) {
     if (sync_opt === undefined) sync_opt = "";
     assertTrue(OptimizationStatus(fun, sync_opt) != 2, name_opt);
   }
 
 })();