RFR(S): 8152358 - code and comment cleanups found during the hunt for 8077392

[Claes Redestad]

Hi,

On 2016-03-29 17:56, Carsten Varming wrote:
> Quick question: Is it time to remove all those unused perf
> variables: _sync_EmptyNotifications, _sync_Notifications,
> _sync_SlowEnter, _sync_SlowExit, _sync_SlowNotify,
> _sync_SlowNotifyAll, _sync_FailedSpins, _sync_SuccessfulSpins,
> _sync_PrivateA, _sync_PrivateB, _sync_MonInCirculation,
> and _sync_MonScavenged.

there's already an RFE for that: 
https://bugs.openjdk.java.net/browse/JDK-8068593

Seems I didn't put _sync_Notifications on the list, maybe just an 
oversight, or it was
actually used at the time.

/Claes