RFR: 8335298: Fix -Wzero-as-null-pointer-constant warning in G1CardSetContainers [v2]

[Kim Barrett]

On Sat, 29 Jun 2024 07:45:19 GMT, Ivan Walulya <iwalulya at openjdk.org> wrote:

>> Kim Barrett has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   change comment to refer to gcc bug
>
> LGTM!

Thanks for reviews @walulyai and @albertnetymk .

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PR Comment: https://git.openjdk.org/jdk/pull/19955#issuecomment-2202377602