[compiler] Check for background serialized in ShouldHaveBeenSerialized

Objects that have kind() kBackgroundSerializedHeapObject also should
have been serialized.

Change-Id: I2a3f17df61477409e94b8858e720e1a2ec720091
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2835709
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Auto-Submit: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74037}

src/compiler/js-heap-broker.cc

@@ -2486,7 +2486,8 @@ bool ObjectRef::equals(const ObjectRef& other) const {
 
 bool ObjectRef::ShouldHaveBeenSerialized() const {
   return broker()->mode() == JSHeapBroker::kSerialized &&
-         data()->kind() == kSerializedHeapObject;
+         (data()->kind() == kSerializedHeapObject ||
+          data()->kind() == kBackgroundSerializedHeapObject);
 }
 
 Isolate* ObjectRef::isolate() const { return broker()->isolate(); }