Prefer `public_send(name)` over `method(name).call`

Before

  $ time bin/inch ../rails/activerecord/
  real  0m56.371s
  user  0m56.274s
  sys 0m0.122s

After

  $ time bin/inch ../rails/activerecord/
  real  0m55.688s
  user  0m55.540s
  sys 0m0.170s