[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 235885cd937c6cf86d04fff336e5f5c2c8f15919..f6c2f34cc5553a9fe8c92005b04e0761444a9336 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -833,6 +833,11 @@ bool String::HasOnlyOneByteChars() {
          IsOneByteRepresentation();
 }
 
+bool StringShape::HasOnlyOneByteChars() {
+  return (type_ & kStringEncodingMask) == kOneByteStringTag ||
+         (type_ & kOneByteDataHintMask) == kOneByteDataHintTag;
+}
+
 bool StringShape::IsCons() {
   return (type_ & kStringRepresentationMask) == kConsStringTag;
 }