[jdk24u] RFR: 8350854: Include thread counts in safepoint logging

Mon Apr 21 01:58:16 UTC 2025

Hi all,

This pull request contains a clean backport of commit [61d9ab97](https://github.com/openjdk/jdk/commit/61d9ab9717783e5bb0faa555f794499d0e5b3fdb) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Xiaolong Peng on 5 Mar 2025 and was reviewed by Aleksey Shipilev and David Holmes.

Thanks!

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Commit messages:
 - Backport 61d9ab9717783e5bb0faa555f794499d0e5b3fdb

Changes: https://git.openjdk.org/jdk24u/pull/202/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk24u&pr=202&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8350854
  Stats: 5 lines in 1 file changed: 3 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk24u/pull/202.diff
  Fetch: git fetch https://git.openjdk.org/jdk24u.git pull/202/head:pull/202

PR: https://git.openjdk.org/jdk24u/pull/202