RFR: 8308594: Use atomic bitset function for PackageEntry::_defined_by_cds_in_class_path

[Calvin Cheung]

On Thu, 25 May 2023 23:25:25 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Please review this simple fix for replacing the implementation in `PackageEntry::set_defined_by_cds_in_class_path()` with `Atomic::fetch_then_or()`.
>> 
>> Passed tier1 testing.
>
> Looks good!

Thanks @coleenp for the review.
Do you think it is a trivial fix?

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PR Comment: https://git.openjdk.org/jdk/pull/14164#issuecomment-1564667838