Remove_unused_arguments (ocaml.Remove_unused

val separate_unused_arguments_in_closures : 
  Flambda.program ->
  backend:(module Backend_intf.S) ->
  Flambda.program

val separate_unused_arguments_in_set_of_closures : 
  Flambda.set_of_closures ->
  backend:(module Backend_intf.S) ->
  Flambda.set_of_closures option