[sledge][NFC] Simplify harness selection code

Summary: Only refactor

Reviewed By: jvillard

Differential Revision: D15424821

fbshipit-source-id: 0e3ea58c3

sledge/src/control.ml

@@ -367,17 +367,14 @@ let harness : Llair.t -> Work.t option =
   List.find_map ["__llair_main"; "_Z12__llair_mainv"; "main"]
     ~f:(fun name ->
       Vector.find_map pgm.functions ~f:(fun func ->
-          let fname = Var.name func.name.var in
-          Option.some_if (String.equal name fname) (fname, func) ) )
+          Option.some_if (String.equal name (Var.name func.name.var)) func
+      ) )
   |> function
-  | Some (("__llair_main" | "_Z12__llair_mainv" | "main"), main) ->
-      let block = main.entry in
-      if List.is_empty block.params then
+  | Some {entry= {params= []} as block} ->
       Some
         (Work.init
            (fst (Domain.call (Domain.init pgm.globals) [] [] block.locals))
            block)
-      else None
   | _ -> None
 
 let exec_pgm : Llair.t -> unit =