[project @ 1999-04-27 15:23:29 by simonm]

Mark PrimOp arguments as lazy.  This stops the simplifier throwing
away cases, and is consistent with the way applications work.  We
could probably do better by using the information from
primOpStrictness.

ghc/compiler/simplCore/OccurAnal.lhs

@@ -606,6 +606,7 @@ occAnal env (Con con args)
 	-- arguments are just variables, or trivial expressions.
 	final_arg_uds    = case con of
 				DataCon _ -> mapVarEnv markMany arg_uds
+				PrimOp _  -> mapVarEnv markLazy arg_uds
 				other	  -> arg_uds
     in
     (final_arg_uds, Con con args')