[compiler] Enable background serialization for non-concurrent inlining

This means that we are now background serializing
RefSerializationKind::kBackgroundSerialized classes on all configs.

Bug: v8:7790
Change-Id: Iaa54718303e07e37a95d3f54d0c4c173d4174967
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3056453Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75952}

src/compiler/heap-refs.cc

@@ -2295,16 +2295,12 @@ struct CreateDataFunctor<RefSerializationKind::kBackgroundSerialized, DataT,
                          ObjectT> {
   bool operator()(JSHeapBroker* broker, RefsMap* refs, Handle<Object> object,
                   RefsMap::Entry** entry_out, ObjectData** object_data_out) {
-    if (broker->is_concurrent_inlining() ||
-        broker->mode() == JSHeapBroker::kSerializing) {
-      RefsMap::Entry* entry = refs->LookupOrInsert(object.address());
-      *object_data_out = broker->zone()->New<DataT>(
-          broker, &entry->value, Handle<ObjectT>::cast(object),
-          kBackgroundSerializedHeapObject);
-      *entry_out = entry;
-      return true;
-    }
-    return false;
+    RefsMap::Entry* entry = refs->LookupOrInsert(object.address());
+    *object_data_out = broker->zone()->New<DataT>(
+        broker, &entry->value, Handle<ObjectT>::cast(object),
+        kBackgroundSerializedHeapObject);
+    *entry_out = entry;
+    return true;
   }
 };