Disallow Object.observe calls on access-checked objects

src/object-observe.js

Index: src/object-observe.js
diff --git a/src/object-observe.js b/src/object-observe.js
index ef3f0aa18d6343f32419f6a6faa36c35dd21a898..5c0e339c2d02860c6811a86882e091372f0d1931 100644
--- a/src/object-observe.js
+++ b/src/object-observe.js
@@ -388,6 +388,8 @@ function ObjectObserve(object, callback, acceptList) {
     throw MakeTypeError(kObserveNonObject, "observe", "observe");
   if (%IsJSGlobalProxy(object))
     throw MakeTypeError(kObserveGlobalProxy, "observe");
+  if (%IsAccessCheckNeeded(object))
+    throw MakeTypeError(kObserveAccessChecked, "observe");
   if (!IS_CALLABLE(callback))
     throw MakeTypeError(kObserveNonFunction, "observe");
   if (ObjectIsFrozen(callback))
@@ -616,6 +618,8 @@ function ObjectGetNotifier(object) {
     throw MakeTypeError(kObserveNonObject, "getNotifier", "getNotifier");
   if (%IsJSGlobalProxy(object))
     throw MakeTypeError(kObserveGlobalProxy, "getNotifier");
+  if (%IsAccessCheckNeeded(object))
+    throw MakeTypeError(kObserveAccessChecked, "getNotifier");
 
   if (ObjectIsFrozen(object)) return null;