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

R=jochen@chromium.org

Review URL: https://codereview.chromium.org/301673002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21518 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/mjsunit/mjsunit.js

@@ -371,13 +371,10 @@ var assertUnoptimized;
     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");
     }
   }