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

test/mjsunit/shift-for-integer-div.js

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-// Flags: --allow-natives-syntax
+// Flags: --allow-natives-syntax --crankshaft
 
 function divp4(x) {
   return x / 4;
 }
 
 divp4(8);
 divp4(8);
 %OptimizeFunctionOnNextCall(divp4);
 assertEquals(2, divp4(8));
 assertEquals(0.5, divp4(2));
@@ skipping 50 matching lines @@
 // Check kMinInt case.
 function div_by_two(x) {
   return (x / 2) | 0;
 }
 
 div_by_two(12);
 div_by_two(34);
 %OptimizeFunctionOnNextCall(div_by_two);
 div_by_two(56);
 assertEquals(-(1 << 30), div_by_two(1 << 31));