Turn on parallel recompilation for tests that assert optimization status.

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

Index: test/mjsunit/harmony/block-let-crankshaft.js
diff --git a/test/mjsunit/harmony/block-let-crankshaft.js b/test/mjsunit/harmony/block-let-crankshaft.js
index d01e5c08ab03b8b899fa7e9dd0bed747501fba89..5888fd24f56c31ead42a0792e28585c4a0f6775e 100644
--- a/test/mjsunit/harmony/block-let-crankshaft.js
+++ b/test/mjsunit/harmony/block-let-crankshaft.js
@@ -25,7 +25,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --harmony-scoping --allow-natives-syntax --noparallel-recompilation
+// Flags: --harmony-scoping --allow-natives-syntax
 
 // TODO(ES6): properly activate extended mode
 "use strict";
@@ -43,7 +43,7 @@ for (var i = 0; i < functions.length; ++i) {
   }
   %OptimizeFunctionOnNextCall(func);
   func(12);
-  assertTrue(%GetOptimizationStatus(func) != 2);
+  assertOptimized(func);
 }
 
 function f1() { }