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

test/debugger/debug/regress/regress-crbug-633999.js

 // Copyright 2016 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: --noturbo
+// Flags: --crankshaft --no-turbo
 
 var Debug = debug.Debug
 var exception = null;
 var step = 0;
 
 function listener(event, exec_state, event_data, data) {
   if (event != Debug.DebugEvent.Exception) return;
   try {
     step++;
   } catch (e) {
@@ skipping 15 matching lines @@
   f();
   f();
   %OptimizeFunctionOnNextCall(f);
   f();
   assertOptimized(f);
 })();
 
 Debug.setListener(null);
 assertNull(exception);
 assertEquals(3, step);