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

test/mjsunit/smi-mul-const.js

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-// Flags: --allow-natives-syntax --noalways-opt
+// Flags: --allow-natives-syntax --crankshaft --noalways-opt
 
 function check(func, input, expected) {
   func(-1);
   func(-1);
   %OptimizeFunctionOnNextCall(func);
   assertEquals(expected, func(input));
   assertOptimized(func);
 }
 
 function mul_by_neg_1(a) { return a * -1; }
@@ skipping 39 matching lines @@
 var two_31 = 2 * two_30;
 
 // TODO(rmcilroy): replace after r16361 with:  if (%IsValidSmi(two_31)) {
 if (true) {
   assertEquals(two_31, mul_by_neg_1(-two_31));
   assertUnoptimized(mul_by_neg_1);
 } else {
   assertEquals(two_30, mul_by_neg_1(-two_30));
   assertUnoptimized(mul_by_neg_1);
 }