Add missing --allow-natives-syntax flag to test case

test/mjsunit/regress/regress-crbug-125148.js

Index: test/mjsunit/regress/regress-crbug-125148.js
diff --git a/test/mjsunit/regress/regress-crbug-125148.js b/test/mjsunit/regress/regress-crbug-125148.js
index ed884652dd0eb90baf029fe3a8533c5b311446d2..025f9a5a4bd358cf71041254de202c4a28408e0d 100644
--- a/test/mjsunit/regress/regress-crbug-125148.js
+++ b/test/mjsunit/regress/regress-crbug-125148.js
@@ -25,6 +25,8 @@
 // (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
+
 var A = {
   foo: function() { assertUnreachable(); }
 }