[jdk21u-dev] RFR: 8342409: [s390x] C1 unwind_handler fails to unlock synchronized methods with LM_MONITOR

[Amit Kumar]

Hi all,

This pull request contains a backport of commit [9201e9fc](https://github.com/openjdk/jdk/commit/9201e9fcc28cff37cf9996e8db38f9aee7511b1c) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Amit Kumar on 18 Oct 2024 and was reviewed by Richard Reingruber and Lutz Schmidt.

Thanks!

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Commit messages:
 - Backport 9201e9fcc28cff37cf9996e8db38f9aee7511b1c

Changes: https://git.openjdk.org/jdk21u-dev/pull/1184/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1184&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8342409
  Stats: 9 lines in 2 files changed: 8 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1184.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1184/head:pull/1184

PR: https://git.openjdk.org/jdk21u-dev/pull/1184