message: Don't ever capture CPU state if timings are disabled
  This should initially help with the panic in but doesn't solve it.
diff: @@ -138,7 +138,7 @@ impl<'a, 'cfg> Timings<'a, 'cfg> {
  unit_times: Vec::new(),
  active: HashMap::new(),
  concurrency: Vec::new(),
  - last_cpu_state: State::current().ok(),
  + last_cpu_state: if enabled { State::current().ok() } else { None },
  last_cpu_recording: Instant::now(),
  cpu_usage: Vec::new(),
  }
  