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

test/mjsunit/array-push5.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
 
 var v = 0;
 
 // Test that elements setters/getters on prototype chain set after the fact are
 // property detected and don't lead to overzealous optimization.
 var my_array_proto = {};
 my_array_proto.__proto__ = [].__proto__;
 
 function push_wrapper_2(array, value) {
   array.push(value);
@@ skipping 17 matching lines @@
 // Defining accessor should deopt optimized push.
 Object.defineProperty(my_array_proto, "3", {
 get: function() { return "get " + v; },
 set: function(value) { v += value; }
 });
 assertUnoptimized(push_wrapper_2);
 push_wrapper_2(array, 99);
 assertEquals(4, array.length);
 assertEquals(99, v);
 assertEquals("get 99", array[3]);