RFR: 8329878: Reduce public interface of CardTableBarrierSet

[Albert Mingkun Yang]

On Mon, 8 Apr 2024 18:40:24 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial moving typedef from public to protected.

Thanks for review.

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PR Comment: https://git.openjdk.org/jdk/pull/18679#issuecomment-2045060570