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

test/mjsunit/regress/regress-2339.js

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-// Flags: --allow-natives-syntax --expose-gc
+// Flags: --allow-natives-syntax --expose-gc --crankshaft
 
 function simple() {
   return simple_two_args(0, undefined);
 }
 
 function simple_two_args(always_zero, always_undefined) {
   var always_five = always_undefined || 5;
   return always_zero * always_five * .5;
 }
 
 
 simple();
 simple();
 %OptimizeFunctionOnNextCall(simple);
 simple();
 assertOptimized(simple);
 gc();