RFR: 8301344: G1: Remove DirtyCardToOopClosure forward declaration in g1OopClosures.hpp

[Albert Mingkun Yang]

On Mon, 30 Jan 2023 12:15:59 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial removing unused declaration.

Thanks for the review.

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PR: https://git.openjdk.org/jdk/pull/12293