RFR: 8364650: G1: Use InvalidCSetIndex instead of UINT_MAX for "invalid" sentinel value of young_index_in_cset

[Albert Mingkun Yang]

On Tue, 5 Aug 2025 21:56:43 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   please review this small change to use `InvalidCSetIndex` instead of hardcoded `UINT_MAX` for `G1HeapRegion::_young_index_in_cset`. Just reuse the existing value that is already in use for `_index_in_opt_cset`.
> 
> Testing: compilation, gha
> 
> Thanks,
>   Thomas

Marked as reviewed by ayang (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/26651#pullrequestreview-3092264030