Remove mutation method from TyepToOpCountMap

loopy/statistics.py

-from __future__ import division, absolute_import
+from __future__ import division, absolute_import, print_function
 
 __copyright__ = "Copyright (C) 2015 James Stevens"
 
@@ -73,9 +73,6 @@ class TypeToOpCountMap:
         except KeyError:
             return isl.PwQPolynomial('{ 0 }')
 
-    def __setitem__(self, index, value):
-        self.dict[index] = value
-
     def __str__(self):
         return str(self.dict)