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

test/mjsunit/constant-folding-2.js

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-// Flags: --nodead-code-elimination --fold-constants --allow-natives-syntax --nostress-opt
+// Flags: --nodead-code-elimination --fold-constants
+// Flags: --allow-natives-syntax --nostress-opt --crankshaft
 
 function test(f) {
   f();
   f();
   %OptimizeFunctionOnNextCall(f);
   f();
   // Assert that there has been no deopt.
   assertOptimized(f);
 }
 
@@ skipping 205 matching lines @@
 });
 
 
 test(function int32Mod() {
   assertEquals(-0, -2147483648 % (-1));
 });
 
 test(function int32Div() {
   assertEquals(2147483648, -2147483648 / (-1));
 });