Introduce NonJSProxyHolder returning Handle<JSObject> and return Handle<JSReceiver> for GetHolder

src/lookup.h

Index: src/lookup.h
diff --git a/src/lookup.h b/src/lookup.h
index c96a1e66e7b981aa04fec81797008e0c65ee075a..c96b2d11dd640d7044b635a29fcb4325f5ae672a 100644
--- a/src/lookup.h
+++ b/src/lookup.h
@@ -93,9 +93,10 @@ class LookupIterator V8_FINAL BASE_EMBEDDED {
     return Handle<Object>::cast(maybe_receiver_.ToHandleChecked());
   }
   Handle<Map> holder_map() const { return holder_map_; }
-  Handle<JSObject> GetHolder() const {
-    ASSERT(IsFound() && state_ != JSPROXY);
-    return Handle<JSObject>::cast(maybe_holder_.ToHandleChecked());
+  template <class T>
+  Handle<T> GetHolder() const {
+    ASSERT(IsFound());
+    return Handle<T>::cast(maybe_holder_.ToHandleChecked());
   }
   Handle<JSReceiver> GetRoot() const;
   bool HolderIsReceiver() const;
@@ -141,11 +142,6 @@ class LookupIterator V8_FINAL BASE_EMBEDDED {
 
   void InternalizeName();
 
-  /* JSPROXY */
-  Handle<JSProxy> GetJSProxy() const {
-    return Handle<JSProxy>::cast(maybe_holder_.ToHandleChecked());
-  }
-
  private:
   Handle<Map> GetReceiverMap() const;