kernel - change print*() functions for ipc to generic ipc hook functions.

- used to implement ipc stats tracking code

kernel/debug.h

@@ -23,7 +23,6 @@
  * are disabled.
  */
 #define DEBUG_ENABLE_IPC_WARNINGS	1
-#define DEBUG_STACKTRACE		1
 
 /* Sanity checks. */
 #define DEBUG_SANITYCHECKS		0
@@ -45,6 +44,13 @@
  */
 #define DEBUG_DUMPIPC			0
 
+/* DEBUG_IPCSTATS collects information on who sends messages to whom. */
+#define DEBUG_IPCSTATS			0
+
+#if DEBUG_DUMPIPC || DEBUG_IPCSTATS	/* either of these needs the hook */
+#define DEBUG_IPC_HOOK			1
+#endif
+
 #if DEBUG_TRACE
 
 #define VF_SCHEDULING		(1L << 1)