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

test/mjsunit/es6/block-scoping.js

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-// Flags: --allow-natives-syntax
+// Flags: --allow-natives-syntax --crankshaft
 // Test functionality of block scopes.
 
 "use strict";
 
 // Hoisting of var declarations.
 function f1() {
   {
     var x = 1;
     var y;
   }
   assertEquals(1, x)
   assertEquals(undefined, y)
 }
 for (var j = 0; j < 5; ++j) f1();
 %OptimizeFunctionOnNextCall(f1);
 f1();
-assertTrue(%GetOptimizationStatus(f1) != 2);
+assertOptimized(f1);
 
 // Dynamic lookup in and through block contexts.
 function f2(one) {
   var x = one + 1;
   let y = one + 2;
   const u = one + 4;
   class a { static foo() { return one + 6; } }
   {
     let z = one + 3;
     const v = one + 5;
@@ skipping 246 matching lines @@
   }
   for (var j = 0; j < 10; j++) {
     y = j + 10;
     assertEquals(j, let_accessors[j]());
     assertEquals(y, var_accessors[j]());
     assertEquals(j, const_accessors[j]());
     assertEquals(j, class_accessors[j]().foo());
   }
 }
 f8();