[tests] Cleanup tests that use assertOptimized()/assertUnoptimized().

test/mjsunit/regress/regress-3709.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
+// Flags: --allow-natives-syntax --crankshaft --no-always-opt
 
 function getobj() {
   return { bar : function() { return 0}};
 }
 
 function foo() {
   var obj = getobj();
   var length = arguments.length;
   if (length == 0) {
      obj.bar();
   } else {
      obj.bar.apply(obj, arguments);
   }
 }
 
 foo();
 foo();
 %OptimizeFunctionOnNextCall(foo);
 foo();
 assertOptimized(foo);
 foo(10);
 assertUnoptimized(foo);
 %ClearFunctionTypeFeedback(foo);