sim: have a curTick per eventq

This patch adds a _curTick variable to an eventq. This variable is updated
whenever an event is serviced in function serviceOne(), or all events upto
a particular time are processed in function serviceEvents(). This change
helps when there are eventqs that do not make use of curTick for scheduling
events.

src/dev/intel_8254_timer.hh

@@ -38,8 +38,9 @@
 
 #include "base/bitunion.hh"
 #include "base/types.hh"
+#include "base/trace.hh"
 #include "debug/Intel8254Timer.hh"
-#include "sim/eventq.hh"
+#include "sim/eventq_impl.hh"
 #include "sim/serialize.hh"
 
 /** Programmable Interval Timer (Intel 8254) */

src/dev/mc146818.hh

@@ -33,7 +33,7 @@
 #ifndef __DEV_MC146818_HH__
 #define __DEV_MC146818_HH__
 
-#include "sim/eventq.hh"
+#include "sim/eventq_impl.hh"
 
 /** Real-Time Clock (MC146818) */
 class MC146818 : public EventManager