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

test/mjsunit/regress/regress-252797.js

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-// Flags: --allow-natives-syntax
+// Flags: --allow-natives-syntax --crankshaft
 
 // The type feedback oracle had a bug when retrieving the map from an IC
 // starting with a negative lookup.
 
 // Create a holder in fast mode.
 var holder = Object.create({}, {
   holderMethod: {value: function() {}}
 });
 assertTrue(%HasFastProperties(holder));
 
@@ skipping 15 matching lines @@
   obj.holderMethod();
 }
 
 callConstantFunctionOnPrototype(receiver);
 callConstantFunctionOnPrototype(receiver);
 %OptimizeFunctionOnNextCall(callConstantFunctionOnPrototype);
 callConstantFunctionOnPrototype(receiver);
 
 // Make sure that the function is still optimized.
 assertOptimized(callConstantFunctionOnPrototype);