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

test/mjsunit/compiler/inlined-array-pop-opt.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
 
 (function() {
   function foo(a) { return a.pop(); }
 
   var x = {};
   var a = [x,x,];
 
   assertEquals(x, foo(a));
   assertEquals(x, foo(a));
   %OptimizeFunctionOnNextCall(foo);
@@ skipping 58 matching lines @@
   function foo(a) { return a.pop(); }
 
   var a = [1, 2, 3];
 
   assertEquals(3, foo(a));
   assertEquals(2, foo(a));
   %OptimizeFunctionOnNextCall(foo);
   assertEquals(1, foo(a));
   assertOptimized(foo);
 })();