systemc: Ensure the terminated event is notified in all cases.

The terminated event was being notified if a process was killed, but
not if it was terminated in other ways. This change moves the
notification into the helper which sets termination related state.

Change-Id: I10aa5ad25875db992c8408dc60f087efc76b336b
Reviewed-on: https://gem5-review.googlesource.com/12057
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

src/systemc/core/process.cc

@@ -220,8 +220,6 @@ Process::kill(bool inc_kids)
     // Inject the kill exception into this process if it's started.
     if (!_needsStart)
         injectException(killException);
-
-    _terminatedEvent.notify();
 }
 
 void
@@ -384,6 +382,8 @@ Process::terminate()
     for (auto s: staticSensitivities)
         delete s;
     staticSensitivities.clear();
+
+    _terminatedEvent.notify();
 }
 
 Process *Process::_newest;