[jdk20u] RFR: 8201516: DebugNonSafepoints generates incorrect information

[Tobias Hartmann]

Backport of [JDK-8201516](https://bugs.openjdk.java.net/browse/JDK-8201516). Applies cleanly. Approval is pending.

Thanks,
Tobias

-------------

Commit messages:
 - 8201516: DebugNonSafepoints generates incorrect information

Changes: https://git.openjdk.org/jdk20u/pull/40/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk20u&pr=40&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8201516
  Stats: 154 lines in 3 files changed: 152 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk20u/pull/40.diff
  Fetch: git fetch https://git.openjdk.org/jdk20u.git pull/40/head:pull/40

PR: https://git.openjdk.org/jdk20u/pull/40