deps: update V8 to 7.6.303.28

PR-URL: https://github.com/nodejs/node/pull/28016
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Refael Ackermann (רפאל פלחי) <refack@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/deps/v8/test/mjsunit/harmony/weakrefs/cleanup-on-detached-realm.js b/deps/v8/test/mjsunit/harmony/weakrefs/cleanup-on-detached-realm.js
new file mode 100644
index 0000000000..ca156e0574
--- /dev/null
+++ b/deps/v8/test/mjsunit/harmony/weakrefs/cleanup-on-detached-realm.js
@@ -0,0 +1,22 @@
+// Copyright 2019 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-weak-refs --expose-gc --noincremental-marking
+
+let r = Realm.create();
+let FG = Realm.eval(r, "FinalizationGroup");
+Realm.detachGlobal(r);
+
+let fg = new FG(()=> {
+  assertUnreachable();
+});
+
+(() => {
+  let object = {};
+  fg.register(object, {});
+
+  // object goes out of scope.
+})();
+
+gc();