message: Fix span of await token in for/for-in/for-of stmts.
diff: @@ -875,8 +875,9 @@ impl<'a, I: Tokens> Parser<'a, I> {
  let start = cur_pos!();
  assert_and_bump!("for");
  + let await_start = cur_pos!();
  let await_token = if eat!("await") {
  - Some(span!(start))
  + Some(span!(await_start))
  } else {
  None
  };
  