Another debugIsOn use

compiler/basicTypes/Unique.lhs

@@ -54,9 +54,8 @@ import BasicTypes
 import FastTypes
 import FastString
 import Outputable
-#ifdef DEBUG
-import StaticFlags	( opt_SuppressUniques )
-#endif
+import StaticFlags
+import Util
 
 #if defined(__GLASGOW_HASKELL__)
 --just for implementing a fast [0,61) -> Char function
@@ -202,11 +201,9 @@ We do sometimes make strings with @Uniques@ in them:
 \begin{code}
 pprUnique :: Unique -> SDoc
 pprUnique uniq
-#ifdef DEBUG
-  | opt_SuppressUniques
+  | debugIsOn && opt_SuppressUniques
   = empty	-- Used exclusively to suppress uniques so you 
   | otherwise	-- can compare output easily
-#endif
   = case unpkUnique uniq of
       (tag, u) -> finish_ppr tag u (text (iToBase62 u))