RFR: 8321814: G1: Remove unused G1RemSetScanState::_collection_set_iter_state

[Albert Mingkun Yang]

On Mon, 11 Dec 2023 19:44:24 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/17068#issuecomment-1851668617