RFR: 8268556: Use bitmap for storing regions that failed evacuation

[Thomas Schatzl]

On Fri, 11 Jun 2021 08:56:06 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Hi all,
>> 
>>   can I have reviews for this follow-up cleanup of the earlier JDK-8267073? It introduced a byte-map for storing information about regions that have already been experienced an evacuation failure.
>> 
>> During review the improvement to use a bitmap instead came up - uses less space and there are existing setters/getters that can be used.
>> 
>> Testing: tier1-4
>
> Looks good.

Thanks @kimbarrett @kstefanj @walulyai  for you reviews.

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PR: https://git.openjdk.java.net/jdk/pull/4471