Adjust the eventlog description header for the spark counter event

The EventLogFormat.h described the spark counter fields in a different
order to that which ghc emits (the GC'd and fizzled fields were
reversed). At this stage it is easier to fix the ghc-events lib and
to have ghc continue to emit them in the current order.

includes/rts/EventLogFormat.h

@@ -132,7 +132,7 @@
 #define EVENT_PROGRAM_ENV         31 /* (capset, environment_vector)  */
 #define EVENT_OSPROCESS_PID       32 /* (capset, pid)          */
 #define EVENT_OSPROCESS_PPID      33 /* (capset, parent_pid)   */
-#define EVENT_SPARK_COUNTERS      34 /* (crt,dud,ovf,cnv,fiz,gcd,rem) */
+#define EVENT_SPARK_COUNTERS      34 /* (crt,dud,ovf,cnv,gcd,fiz,rem) */
 #define EVENT_SPARK_CREATE        35 /* ()                     */
 #define EVENT_SPARK_DUD           36 /* ()                     */
 #define EVENT_SPARK_OVERFLOW      37 /* ()                     */

rts/eventlog/EventLog.c

@@ -619,6 +619,7 @@ postSparkCountersEvent (Capability *cap,
     }
     
     postEventHeader(eb, EVENT_SPARK_COUNTERS);
+    /* EVENT_SPARK_COUNTERS (crt,dud,ovf,cnv,gcd,fiz,rem) */
     postWord64(eb,counters.created);
     postWord64(eb,counters.dud);
     postWord64(eb,counters.overflowed);