[key] Fix for-in with trailing shadowing keys with dict-mode receiver

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index c7a5ab69ffe0787abcfe426800be690488c25e5c..fb4f69846d52128bc9d12c7fd0ca26238ba3ede4 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -18047,6 +18047,7 @@ void Dictionary<Derived, Shape, Key>::CopyEnumKeysTo(
     Handle<Dictionary<Derived, Shape, Key>> dictionary,
     Handle<FixedArray> storage, KeyCollectionMode mode,
     KeyAccumulator* accumulator) {
+  DCHECK_IMPLIES(mode != KeyCollectionMode::kOwnOnly, accumulator != nullptr);
   Isolate* isolate = dictionary->GetIsolate();
   int length = storage->length();
   int capacity = dictionary->Capacity();
@@ -18072,7 +18073,7 @@ void Dictionary<Derived, Shape, Key>::CopyEnumKeysTo(
       storage->set(properties, Smi::FromInt(i));
     }
     properties++;
-    if (properties == length) break;
+    if (mode == KeyCollectionMode::kOwnOnly && properties == length) break;
   }
 
   CHECK_EQ(length, properties);