RFR: 8212826: Make PtrQueue free list lock-free

[Kim Barrett]

> On Jan 19, 2019, at 2:26 AM, sangheon.kim at oracle.com wrote:
>> 
>> New webrevs:
>> full: http://cr.openjdk.java.net/~kbarrett/8212826/open.01/
>> incr: http://cr.openjdk.java.net/~kbarrett/8212826/open.01.inc/
> 01 looks good.

Thanks.

> FYI, 4 files failed(ptrQueue.hpp, logTag.hpp padded.hpp mutexLocker.hpp) to apply because the copyright year is already updated.
> Actual codes were applied cleanly. I don't need a webrev for this change.

Yeah.  I should get one of those copyright updater scripts various people use, so I can deal with it just before pushing.
Of course, this year there will be much less of a need for updates, since Coleen has already touched most .hpp files.