attempt compat. with GHC 9.x

Author: pepeiborra

Diff for: ghcide/src/Development/IDE/GHC/Orphans.hs

@@ -51,6 +51,8 @@ instance Hashable GhcPlugins.InstalledUnitId where
   hashWithSalt salt = hashWithSalt salt . installedUnitIdString
 #else
 instance Show InstalledUnitId where show = prettyPrint
+deriving instance Ord SrcSpan
+deriving instance Ord UnhelpfulSpanReason
 #endif
 
 instance NFData SB.StringBuffer where rnf = rwhnf