RFR: 8304016: Add BitMap find_last suite of functions [v2]

[Kim Barrett]

On Mon, 20 Mar 2023 09:11:57 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> Kim Barrett has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - shrink find_first_bit_impl
>>  - improve find_last_bit_impl
>
> Thanks for creating this PR. As we have discussed offline, this is not my preferred code style for these functions, but I'm happy to see this functionality being upstreamed, so consider this reviewed.

Thanks for reviews @stefank and @xmas92

-------------

PR Comment: https://git.openjdk.org/jdk/pull/12988#issuecomment-1476810717