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

[Calvin Cheung]

On Fri, 26 May 2023 17:36:47 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.
>
> Yes. Looks trivial.

Thanks @coleenp and @lfoltan for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/14164#issuecomment-1564739924