RFR: 8257466: Improve enum iteration [v2]

[Kim Barrett]

On Wed, 2 Dec 2020 05:39:50 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> Kim Barrett has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   iklam review
>
> Marked as reviewed by iklam (Reviewer).

Thanks for reviewing @iklam and @lfoltan

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PR: https://git.openjdk.java.net/jdk/pull/1530