Test: ignore inferred arity in case of %raw.

The inferred arity of raw JS code is actively used with `%ffi`, but it can produce unexpected results with `%raw`:

```
let foo: int => int = %raw(`function add(x, y=5){ return x + y }`)

Console.log(foo(2))
```

Author: cristianoc

compiler/core/lam_arity_analysis.ml

@@ -69,7 +69,8 @@ let rec get_arity (meta : Lam_stats.t) (lam : Lam.t) : Lam_arity.t =
     with
     | Submodule subs -> subs.(m) (* TODO: shall we store it as array?*)
     | Single _ -> Lam_arity.na)
-  | Lprim {primitive = Praw_js_code {code_info = Exp (Js_function {arity})}} ->
+  | Lprim {primitive = Praw_js_code {code_info = Exp (Js_function {arity})}}
+    when false ->
     Lam_arity.info [arity] false
   | Lprim {primitive = Praise; _} -> Lam_arity.raise_arity_info
   | Lglobal_module _ (* TODO: fix me never going to happen *) | Lprim _ ->

compiler/core/lam_pass_collect.ml

@@ -68,7 +68,8 @@ let collect_info (meta : Lam_stats.t) (lam : Lam.t) =
         {
           primitive = Praw_js_code {code_info = Exp (Js_function {arity})};
           args = _;
-        } ->
+        }
+      when false ->
       Hash_ident.replace meta.ident_tbl ident
         (FunctionId {arity = Lam_arity.info [arity] false; lambda = None})
     | Lprim {primitive = Pnull_to_opt; args = [(Lvar _ as l)]; _} ->