Turn on parallel recompilation for tests that assert optimization status.

test/mjsunit/harmony/block-let-crankshaft.js

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-// Flags: --harmony-scoping --allow-natives-syntax --noparallel-recompilation
+// Flags: --harmony-scoping --allow-natives-syntax
 
 // TODO(ES6): properly activate extended mode
 "use strict";
 
 // Check that the following functions are optimizable.
 var functions = [ f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, f11, f12, f13, f14,
                   f15, f16, f17, f18, f19, f20, f21, f22, f23 ];
 
 for (var i = 0; i < functions.length; ++i) {
   var func = functions[i];
   print("Testing:");
   print(func);
   for (var j = 0; j < 10; ++j) {
     func(12);
   }
   %OptimizeFunctionOnNextCall(func);
   func(12);
-  assertTrue(%GetOptimizationStatus(func) != 2);
+  assertOptimized(func);
 }
 
 function f1() { }
 
 function f2(x) { }
 
 function f3() {
   let x;
 }
 
@@ skipping 196 matching lines @@
   f(42, true);
 } catch (e) {
   assertInstanceof(e, ReferenceError);
 }
 
 try {
   g(42, true);
 } catch (e) {
   assertInstanceof(e, ReferenceError);
 }