RFR: 8341909: G1: Add region index to region printer output

[Kim Barrett]

On Thu, 10 Oct 2024 15:13:48 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   please review this small improvement to the G1HeapRegionPrinter output to add the region index - this makes cross-referencing with other log messages much easier.
> 
> Testing: gha
> 
> Thanks,
>   Thomas

Looks good.

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Marked as reviewed by kbarrett (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/21454#pullrequestreview-2361457504