[ORC-RT] Remove a stray __orc_rt::string_view helper.

This function was accidentally left in after 1dcff823db9.

GitOrigin-RevId: aa2a3196e28425c6bcf74bbf913efeda1f7fa1c7
diff --git a/lib/orc/adt.h b/lib/orc/adt.h
index a76aa5a..8884cc8 100644
--- a/lib/orc/adt.h
+++ b/lib/orc/adt.h
@@ -58,10 +58,6 @@
   size_type Size = 0;
 };
 
-inline std::ostream &operator<<(std::ostream &OS, std::string_view S) {
-  return OS.write(S.data(), S.size());
-}
-
 } // end namespace __orc_rt
 
 #endif // ORC_RT_ADT_H