[builtins] HasOwnProperty: handle non-internalized string keys

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 04e0511a57846fcda7a9734c8c49c4cf06fa1f1d..9f84314aa65fc22d3a82e8aa6a1c559d377db018 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -831,6 +831,11 @@ bool String::HasOnlyOneByteChars() {
          IsOneByteRepresentation();
 }
 
+bool StringShape::HasOnlyOneByteChars() {
+  return (type_ & kStringEncodingMask) == kOneByteStringTag ||
+         (type_ & kOneByteDataHintMask) == kOneByteDataHintTag;
+}
+
 bool StringShape::IsCons() {
   return (type_ & kStringRepresentationMask) == kConsStringTag;
 }