Put --noalways-opt flag back into regress-crbug-245480

This is a partial revert of 3eb277f270.

R=machenbach@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/1087183002

Cr-Commit-Position: refs/heads/master@{#27835}

test/mjsunit/regress/regress-crbug-245480.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: --allow-natives-syntax --expose-gc
+// Flags: --allow-natives-syntax --expose-gc --noalways-opt
 
 function isHoley(obj) {
   if (%HasFastHoleyElements(obj)) return true;