Remove some unnecessary imports

compiler/cmm/PprC.hs

@@ -54,11 +54,6 @@ import Data.Char
 import System.IO
 import Data.Word
 
-#ifdef DEBUG
-import PprCmm		() -- instances only
--- import Debug.Trace
-#endif
-
 import Data.Array.ST
 import Control.Monad.ST
 

compiler/deSugar/DsCCall.lhs

@@ -48,11 +48,6 @@ import PrelNames
 import VarSet
 import Constants
 import Outputable
-
-#ifdef DEBUG
-import TypeRep
-#endif
-
 \end{code}
 
 Desugaring of @ccall@s consists of adding some state manipulation,