[runtime] Fix integer indexed property handling

src/lookup.h

Index: src/lookup.h
diff --git a/src/lookup.h b/src/lookup.h
index 6fe68dc65ec84a9f4a8b75e1e1316e0ccd275a78..3fccba57db8b45c33ecd6eb938e4f63808de095b 100644
--- a/src/lookup.h
+++ b/src/lookup.h
@@ -48,7 +48,6 @@ class LookupIterator final BASE_EMBEDDED {
                  Configuration configuration = DEFAULT)
       : configuration_(ComputeConfiguration(configuration, name)),
         state_(NOT_FOUND),
-        exotic_index_state_(ExoticIndexState::kUninitialized),
         interceptor_state_(InterceptorState::kUninitialized),
         property_details_(PropertyDetails::Empty()),
         isolate_(name->GetIsolate()),
@@ -72,7 +71,6 @@ class LookupIterator final BASE_EMBEDDED {
                  Configuration configuration = DEFAULT)
       : configuration_(ComputeConfiguration(configuration, name)),
         state_(NOT_FOUND),
-        exotic_index_state_(ExoticIndexState::kUninitialized),
         interceptor_state_(InterceptorState::kUninitialized),
         property_details_(PropertyDetails::Empty()),
         isolate_(name->GetIsolate()),
@@ -95,7 +93,6 @@ class LookupIterator final BASE_EMBEDDED {
                  Configuration configuration = DEFAULT)
       : configuration_(configuration),
         state_(NOT_FOUND),
-        exotic_index_state_(ExoticIndexState::kUninitialized),
         interceptor_state_(InterceptorState::kUninitialized),
         property_details_(PropertyDetails::Empty()),
         isolate_(isolate),
@@ -116,7 +113,6 @@ class LookupIterator final BASE_EMBEDDED {
                  Configuration configuration = DEFAULT)
       : configuration_(configuration),
         state_(NOT_FOUND),
-        exotic_index_state_(ExoticIndexState::kUninitialized),
         interceptor_state_(InterceptorState::kUninitialized),
         property_details_(PropertyDetails::Empty()),
         isolate_(isolate),
@@ -280,7 +276,9 @@ class LookupIterator final BASE_EMBEDDED {
   void ReloadPropertyInformation();
   inline bool SkipInterceptor(JSObject* holder);
   bool HasInterceptor(Map* map) const;
-  bool InternalHolderIsReceiverOrHiddenPrototype() const;
+  // Checks whether |object| is receiver_ or one of its hidden prototypes.
+  // |object| has to be initial_holder_ or on its prototype chain.
+  bool IsReceiverOrHiddenPrototype(JSReceiver* object) const;
   inline InterceptorInfo* GetInterceptor(JSObject* holder) const {
     if (IsElement()) return holder->GetIndexedInterceptor();
     return holder->GetNamedInterceptor();
@@ -320,7 +318,6 @@ class LookupIterator final BASE_EMBEDDED {
     return GetRootForNonJSReceiver(isolate, receiver, index);
   }
 
-  enum class ExoticIndexState { kUninitialized, kNotExotic, kExotic };
   inline bool IsIntegerIndexedExotic(JSReceiver* holder);
 
   // If configuration_ becomes mutable, update
@@ -328,7 +325,6 @@ class LookupIterator final BASE_EMBEDDED {
   const Configuration configuration_;
   State state_;
   bool has_property_;
-  ExoticIndexState exotic_index_state_;
   InterceptorState interceptor_state_;
   PropertyDetails property_details_;
   Isolate* const isolate_;