Revert "replace List.chop with List.splitAt"

This reverts commit cde206b.

# Conflicts:
#	src/fsharp/SignatureConformance.fs

src/absil/illib.fs

@@ -279,11 +279,22 @@ module List =
         | [] -> None
         | h::t -> if f h then Some (h,n) else findi (n+1) f t
 
+
+    let take n l = 
+        if n = List.length l then l else 
+        let rec loop acc n l = 
+            match l with
+            | []    -> List.rev acc
+            | x::xs -> if n<=0 then List.rev acc else loop (x::acc) (n-1) xs
+
+        loop [] n l
+
     let rec drop n l = 
         match l with 
         | []    -> []
         | _::xs -> if n=0 then l else drop (n-1) xs
 
+
     let splitChoose select l =
         let rec ch acc1 acc2 l = 
             match l with