Fix mjsunit's assertOptimized and assertUnoptimized.

This was broken some time ago by a refactor.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/349423003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21995 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/mjsunit/mjsunit-assertoptimized.js

+// Copyright 2014 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 --crankshaft
+
+function f() {};
+f();
+f();
+%OptimizeFunctionOnNextCall(f);
+f();
+assertOptimized(f);
+assertThrows(function() { assertUnoptimized(f); });
+%DeoptimizeFunction(f);
+assertUnoptimized(f);
+assertThrows(function() { assertOptimized(f); });
+quit();  // Prevent stress runs.

test/mjsunit/mjsunit.js

@@ -391,9 +391,8 @@ var assertUnoptimized;
       } catch (e) {
         throw new Error("natives syntax not allowed");
       }
-    } else {
-      OptimizationStatusImpl(fun, sync_opt);
     }
+    return OptimizationStatusImpl(fun, sync_opt);
   }
 
   assertUnoptimized = function assertUnoptimized(fun, sync_opt, name_opt) {