val run : 
  never_inline:bool ->
  backend:(module Backend_intf.S) ->
  prefixname:string ->
  round:int ->
  ppf_dump:Format.formatter ->
  Flambda.program ->
  Flambda.programSimplification of Flambda programs combined with function inlining: for the most part a beta-reduction pass.
Readers interested in the inlining strategy should read the Inlining_decision module first.
val duplicate_function : 
  env:Inline_and_simplify_aux.Env.t ->
  set_of_closures:Flambda.set_of_closures ->
  fun_var:Variable.t ->
  new_fun_var:Variable.t ->
  Flambda.function_declaration * Flambda.specialised_to Variable.Map.t
