Restore Enum.sum_by used in Registry.count_match

Author: studzien

lib/elixir/lib/registry.ex

@@ -1400,11 +1400,9 @@ defmodule Registry do
         :ets.select_count(key_ets, spec)
 
       {{:duplicate, _}, partitions, _key_ets} ->
-        0..(partitions - 1)
-        |> Enum.map(fn partition_index ->
+        Enum.sum_by(0..(partitions - 1), fn partition_index ->
           :ets.select_count(key_ets!(registry, partition_index), spec)
         end)
-        |> Enum.sum()
     end
   end