RFR: 8364531: G1: Factor out liveness tracing code [v4]

[Thomas Schatzl]

On Mon, 4 Aug 2025 20:02:13 GMT, Sangheon Kim <sangheki at openjdk.org> wrote:

> Looks good as is.
> 
> This might be a preference thing. log_xxx_group() doesn't update _total_remset_bytes while log_xxx_grouplist() updates it. It might be better to update it from log_xxx_group() with or without proper name change? e.g. append_total_and_log_cset_candidate()

I originally considered that then did not do, fixed.

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PR Comment: https://git.openjdk.org/jdk/pull/26591#issuecomment-3154001490