RFR: 8304657: G1: Rename set_state_empty to set_state_untracked

[Albert Mingkun Yang]

On Tue, 21 Mar 2023 12:14:11 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial renaming.

Thanks for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/13118#issuecomment-1479267261