RFR(S): 8210514: Obsolete SyncVerbose

[Mikael Vidstedt]

Please review this change which obsoletes the SyncVerbose flag.

Bug: https://bugs.openjdk.java.net/browse/JDK-8210514 <https://bugs.openjdk.java.net/browse/JDK-8210514>
Webrev: http://cr.openjdk.java.net/~mikael/webrevs/8210514/webrev.00/open/webrev/ <http://cr.openjdk.java.net/~mikael/webrevs/8210514/webrev.00/open/webrev/>

* Background (from bug)

The experimental SyncVerbose flag can in theory be used to produce logging of some synchronization primitives. The flag was convenient when the synchronization implementation was implemented and tuned a long time ago. 

The SyncVerbose flag no longer serves the purpose it used to, and is "Unstable" (the documentation of the flag says so explicitly). It should be obsoleted and later removed.


Testing: I’m running the normal tier1 testing (still in progress).

Cheers,
Mikael