Don't compile functions in a context the caller doesn't have access to

test/mjsunit/lookup-behind-property.js

Index: test/mjsunit/lookup-behind-property.js
diff --git a/test/mjsunit/lookup-behind-property.js b/test/mjsunit/lookup-behind-property.js
index abf1a52fbcca4c2b0501168a1519531e675556a7..9af3715353695f70206ac97b6fe9d4477a743ce9 100644
--- a/test/mjsunit/lookup-behind-property.js
+++ b/test/mjsunit/lookup-behind-property.js
@@ -2,5 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// Flags: --restricted-realms
+
 var g = Realm.global(Realm.create());
 assertThrows(()=>g.toString());