Add LookupIterator constructor for arbitrary Object keys

src/lookup.h

Index: src/lookup.h
diff --git a/src/lookup.h b/src/lookup.h
index 3888ed624057231fd1d8266363ed6abf888849be..991050cb795c5e6c0538e1843ac24617786d2caa 100644
--- a/src/lookup.h
+++ b/src/lookup.h
@@ -158,6 +158,10 @@ class LookupIterator final BASE_EMBEDDED {
     return it;
   }
 
+  static LookupIterator PropertyOrElement(
+      Isolate* isolate, Handle<Object> receiver, Handle<Object> name,
+      bool* success, Configuration configuration = DEFAULT);
+
   Isolate* isolate() const { return isolate_; }
   State state() const { return state_; }