RFR: 8315689: G1: Remove unused init_hash_seed

[Albert Mingkun Yang]

On Tue, 5 Sep 2023 12:33:41 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial removing dead code.

Thanks for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/15566#issuecomment-1708003857