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

test/mjsunit/div-mul-minus-one.js

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-// Flags: --allow-natives-syntax
+// Flags: --allow-natives-syntax --crankshaft
 
 function div(g) {
   return (g/-1) ^ 1
 }
 
 var kMinInt = 1 << 31;
 var expected_MinInt = div(kMinInt);
 var expected_minus_zero = div(0);
 %OptimizeFunctionOnNextCall(div);
 assertEquals(expected_MinInt, div(kMinInt));
 assertEquals(expected_minus_zero , div(0));
 
 function mul(g) {
   return (g * -1) ^ 1
 }
 
 expected_MinInt = mul(kMinInt);
 expected_minus_zero = mul(0);
 %OptimizeFunctionOnNextCall(mul);
 assertEquals(expected_MinInt, mul(kMinInt));
 assertOptimized(mul);
 assertEquals(expected_minus_zero , mul(0));
 assertOptimized(mul);