Restore Enum.sum_by used in Registry.count_select

Author: studzien

lib/elixir/lib/registry.ex

@@ -1493,11 +1493,9 @@ defmodule Registry do
 
     case key_info!(registry) do
       {_kind, partitions, nil} ->
-        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()
 
       {_kind, 1, key_ets} ->
         :ets.select_count(key_ets, spec)