[builtins] HasOwnProperty: handle non-internalized string keys

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 0c03575c1e74b792c729d8fc67ad43fdc13153cd..1e247bd96081b379c47fc2d9e9aee55f52827cac 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -7818,7 +7818,7 @@ class StringShape BASE_EMBEDDED {
   inline StringRepresentationTag representation_tag();
   inline uint32_t encoding_tag();
   inline uint32_t full_representation_tag();
-  inline uint32_t size_tag();
+  inline bool HasOnlyOneByteChars();
 #ifdef DEBUG
   inline uint32_t type() { return type_; }
   inline void invalidate() { valid_ = false; }