A small memory use reduction.

node/RuntimeEnvironment.hpp

@@ -53,6 +53,7 @@ public:
 	RuntimeEnvironment(Node *n) :
 		node(n)
 		,localNetworkController((NetworkController *)0)
+		,rtmem((void *)0)
 		,sw((Switch *)0)
 		,mc((Multicaster *)0)
 		,topology((Topology *)0)
@@ -73,6 +74,9 @@ public:
 	// This is set externally to an instance of this base class
 	NetworkController *localNetworkController;
 
+	// Memory actually occupied by Trace, Switch, etc.
+	void *rtmem;
+
 	/* Order matters a bit here. These are constructed in this order
 	 * and then deleted in the opposite order on Node exit. The order ensures
 	 * that things that are needed are there before they're needed.