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

test/mjsunit/regress/regress-crbug-594183.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: --allow-natives-syntax
+// Flags: --allow-natives-syntax --crankshaft --no-always-opt
 
 var global = {}
 
 var fish = [
   {'name': 'foo'},
   {'name': 'bar'},
 ];
 
 for (var i = 0; i < fish.length; i++) {
   global[fish[i].name] = 1;
@@ skipping 57 matching lines @@
 inferrable_store(0);
 inferrable_store(0);
 %OptimizeFunctionOnNextCall(inferrable_store);
 inferrable_store(0);
 assertOptimized(inferrable_store);
 // If |inferrable_store| emitted a generic keyed store, it won't deopt upon
 // seeing a property name key. It should have inferred a receiver map and
 // emitted an elements store, however.
 inferrable_store("deopt");
 assertUnoptimized(inferrable_store);