Track the number of notifications/timeouts that are scheduled at any given time. This lets us implement sc_pending_activity_at_current_time, sc_pending_activity_at_future_time, and sc_time_to_pending_activity. Change-Id: Ia3fcd29bdbfe1a6c77eb52ce4836982d4705263c Reviewed-on: https://gem5-review.googlesource.com/12032 Reviewed-by: Gabe Black <gabeblack@google.com> Maintainer: Gabe Black <gabeblack@google.com>