RFR: 8258810: Improve enum traits [v2]

[Kim Barrett]

> On Jan 11, 2021, at 3:37 PM, Lois Foltan <lfoltan at openjdk.java.net> wrote:
> 
> On Fri, 1 Jan 2021 09:44:18 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:
> 
>>> Please review these miscellaneous improvements to the enum iteration facility.
>>> Thanks to @albertnetymk for discussions.
>>> 
>>> […]
>> 
>> Kim Barrett has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>  ayang review
> 
> LGTM.
> Lois
> 
> -------------
> 
> Marked as reviewed by lfoltan (Reviewer).
> 
> PR: https://git.openjdk.java.net/jdk/pull/1868

Thanks.