cpu: Make accesses to comInstEventQueue indirect through methods.

This lets us move the event queue itself around, or change how those
services are provided.

Change-Id: Ie36665b353cf9788968f253cf281a854a6eff4f4
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/22107
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/cpu/o3/cpu.cc

@@ -1521,7 +1521,7 @@ FullO3CPU<Impl>::instDone(ThreadID tid, const DynInstPtr &inst)
         system->totalNumInsts++;
 
         // Check for instruction-count-based events.
-        comInstEventQueue[tid]->serviceEvents(thread[tid]->numInst);
+        serviceInstCountEvents(tid, thread[tid]->numInst);
     }
     thread[tid]->numOp++;
     thread[tid]->numOps++;

src/cpu/o3/probe/elastic_trace.cc

@@ -109,8 +109,8 @@ ElasticTrace::regProbeListeners()
     } else {
         // Schedule an event to register all elastic trace probes when
         // specified no. of instructions are committed.
-        cpu->comInstEventQueue[(ThreadID)0]->schedule(&regEtraceListenersEvent,
-                                                      startTraceInst);
+        cpu->scheduleInstCountEvent(
+                0, &regEtraceListenersEvent, startTraceInst);
     }
 }