cpu: Make the ThreadContext a PCEventScope.

Both the thread and system's PCEventQueue are checked when appropriate.

Change-Id: I16c371339c91a37b5641860d974e546a30e23e13
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/22105
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/cpu/o3/commit_impl.hh

@@ -1114,6 +1114,8 @@ DefaultCommit<Impl>::commitInsts()
                         oldpc = pc[tid].instAddr();
                         cpu->system->pcEventQueue.service(
                                 oldpc, thread[tid]->getTC());
+                        thread[tid]->pcEventQueue.service(
+                                oldpc, thread[tid]->getTC());
                         count++;
                     } while (oldpc != pc[tid].instAddr());
                     if (count > 1) {