RFR: 8234131: Miscellaneous changes imported from jsr166 CVS 2020-12 [v2]

[Doug Lea]

On 12/8/20 3:56 AM, Alan Bateman wrote:
>> 1558:                     break;
>> 1559:             }
>> 1560:             */
> Is this meant to be commented out?
Yes, but It should be marked as a possible improvement, not yet 
committed. While this (prestarting) would improve performance in some 
scenarios, it may also disrupt expectations and even tooling in some 
existing usages, which we haven't fully checked out.