Reformat code, add comment.

Cython/Compiler/Code.py

@@ -906,9 +906,11 @@ class FunctionState(object):
         try-except and try-finally blocks to clean up temps in the
         error case.
         """
-        return sorted([(cname, type)
+        return sorted([  # Enforce deterministic order.
+            (cname, type)
             for (type, manage_ref), freelist in self.temps_free.items() if manage_ref
-                      for cname in freelist[0]])
+            for cname in freelist[0]
+        ])
 
     def start_collecting_temps(self):
         """