Rollup merge of rust-lang#47302 - andjo403:commentfix, r=michaelwoeri…

…ster

fix faulty comment

after rust-lang#43506 there is no fixed number of request sent.

src/librustc_trans/back/write.rs

@@ -1360,15 +1360,10 @@ fn start_executing_work(tcx: TyCtxt,
  let sess = tcx.sess;
 
  // First up, convert our jobserver into a helper thread so we can use normal
- // mpsc channels to manage our messages and such. Once we've got the helper
- // thread then request `n-1` tokens because all of our work items are ready
- // to go.
- //
- // Note that the `n-1` is here because we ourselves have a token (our
- // process) and we'll use that token to execute at least one unit of work.
- //
- // After we've requested all these tokens then we'll, when we can, get
- // tokens on `rx` above which will get managed in the main loop below.
+ // mpsc channels to manage our messages and such.
+ // After we've requested tokens then we'll, when we can,
+ // get tokens on `coordinator_receive` which will
+ // get managed in the main loop below.
  let coordinator_send2 = coordinator_send.clone();
  let helper = jobserver.into_helper_thread(move |token| {
  drop(coordinator_send2.send(Box::new(Message::Token(token))));