RFR: 8365024: G1: Make G1CollectionSet::_inc_build_state assert-only

[Albert Mingkun Yang]

On Thu, 7 Aug 2025 09:46:52 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   please review this change that makes the `G1CollectionSet::_inc_build_state` member debug/assert-only - it's only ever used in assertions.
> 
> Testing: local compilation, gha
> 
> Thanks,
>   Thomas

Marked as reviewed by ayang (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/26671#pullrequestreview-3097122894