[tests] Make assertOptimized()/assertUnoptimized() great again.

test/mjsunit/keyed-load-with-symbol-key.js

Index: test/mjsunit/keyed-load-with-symbol-key.js
diff --git a/test/mjsunit/keyed-load-with-symbol-key.js b/test/mjsunit/keyed-load-with-symbol-key.js
index 15562be6bde2eb50ac8b2ce4464c66555240bb50..36e94ad7fb5fe9fcb290eadbd794e93a60c0c6bb 100644
--- a/test/mjsunit/keyed-load-with-symbol-key.js
+++ b/test/mjsunit/keyed-load-with-symbol-key.js
@@ -25,7 +25,10 @@
 // (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
+// Flags: --allow-natives-syntax --no-always-opt
+
+assertFalse(isAlwaysOptimize());
+
 var s = Symbol("foo");
 
 var o = {