RFR: 8350854: Include thread counts in safepoint logging

[Xiaolong Peng]

On Tue, 4 Mar 2025 13:28:15 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> The question now is, why not just `%d` then?
>
> Maybe we should get rid of INT32_FORMAT too?

I think INT32_FORMAT makes the code style more consistent within the context, but I am ok with using `%d` here.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23838#discussion_r1979921091