RFR: 8304759: Add BitMap iterators [v2]

[Kim Barrett]

On Wed, 29 Mar 2023 09:23:49 GMT, Axel Boldt-Christmas <aboldtch at openjdk.org> wrote:

>> Kim Barrett has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   better names for step functions
>
> lgtm. 
> 
> Just a comment about the comments for `first()`/`last()`

Thanks @xmas92 , @stefank , and @tschatzl for reviews.

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PR Comment: https://git.openjdk.org/jdk/pull/13184#issuecomment-1488998065