RFR: 8287215: Add method to scan bitmap backwards [v5]

[Kim Barrett]

On Mon, 30 May 2022 13:31:29 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Hi all,
>> 
>>   can I have reviews for this change that adds a method to scan bitmaps backwards? This functionality is necessary for upcoming change to remove on of the mark bitmaps [JDK-8210708](https://bugs.openjdk.java.net/browse/JDK-8210708).
>> 
>> As such this is only an addition of that functionality with no reference (apart from the gtest) from Hotspot itself.
>> 
>> Testing: gtest
>> 
>> Thanks,
>>   Thomas
>
> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
> 
>   kbarrett review

Looks good.

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Marked as reviewed by kbarrett (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/8869