RFR: 8330359: G1: Remove unused forward declaration in g1BlockOffsetTable.hpp

[Albert Mingkun Yang]

On Tue, 16 Apr 2024 12:07:09 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial removing dead code.

Thanks for review.

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PR Comment: https://git.openjdk.org/jdk/pull/18797#issuecomment-2059146147