RFR: 8315605: G1: Add number of nmethods in code roots scanning statistics

[Ivan Walulya]

On Thu, 7 Sep 2023 07:55:29 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   please review this change that adds nmethod count statistics during Code Root Scan to be able to implement [JDK-8030815](https://bugs.openjdk.org/browse/JDK-8030815).
> 
> Testing: gha, checking that the message appears manually
> 
> Thanks,
>   Thomas

Marked as reviewed by iwalulya (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/15610#pullrequestreview-1615823607