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

test/mjsunit/array-feedback.js

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 // Flags: --allow-natives-syntax --expose-gc
-// Flags: --noalways-opt
+// Flags: --crankshaft --no-always-opt
 
 var elements_kind = {
   fast_smi_only            :  'fast smi only elements',
   fast                     :  'fast elements',
   fast_double              :  'fast double elements',
   dictionary               :  'dictionary elements',
   external_byte            :  'external byte elements',
   external_unsigned_byte   :  'external unsigned byte elements',
   external_short           :  'external short elements',
   external_unsigned_short  :  'external unsigned short elements',
@@ skipping 160 matching lines @@
   }
 
   var realmBArray = Realm.eval(realmB, "Array");
   instanceof_check(Array);
   instanceof_check(Array);
   instanceof_check(Array);
   instanceof_check(realmBArray);
   instanceof_check(realmBArray);
   instanceof_check(realmBArray);
 })();