Really switch to nubOrd

Author: pepeiborra

ghcide/src/Development/IDE/Core/Tracing.hs

@@ -100,7 +100,7 @@ performMeasurement logger stateRef instrumentFor mapCountInstrument = do
     withSpan_ "Measure length" $ readVar stateRef >>= observe mapCountInstrument . length
 
     values <- readVar stateRef
-    let keys = nub
+    let keys = nubOrd
                     $ Key GhcSession : Key GhcSessionDeps
                     : [ k | (_,k) <- HMap.keys values
                         -- do GhcSessionIO last since it closes over stateRef itself
@@ -111,8 +111,6 @@ performMeasurement logger stateRef instrumentFor mapCountInstrument = do
         `catch` \(e::SomeException) ->
         logInfo logger ("MEMORY PROFILING ERROR: " <> fromString (show e))
 
-{-# ANN performMeasurement ("HLint: ignore Use nubOrd" :: String) #-}
-
 type OurValueObserver = Int -> IO ()
 
 getInstrumentCached :: IO (Maybe Key -> IO OurValueObserver)