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

test/mjsunit/keyed-load-hole-to-undefined.js

 // Copyright 2015 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: --nostress-opt
+// Flags: --no-stress-opt --crankshaft --no-always-opt
 
 // --nostress-opt is specified because the test corrupts the "pristine"
 // array prototype chain by storing an element, and this is tracked
 // per-isolate. A subsequent stress run would send the load generic,
 // and no more deoptimizations of foo would occur.
 
 function foo(a, i) { return a[i]; }
 
 var a = ['one', , 'three'];
 foo(a, 0);
 foo(a, 0);
 foo(a, 0);
 %OptimizeFunctionOnNextCall(foo);
 assertEquals(undefined, foo(a, 1));
 assertOptimized(foo);
 
 // Whereas if we disrupt the prototype chain...
 Array.prototype[1] = 'cow';
 assertEquals('cow', foo(a, 1));
 assertUnoptimized(foo);