[jdk21u] RFR: 8308479: [s390x] Implement alternative fast-locking scheme

Tue Nov 7 06:57:56 UTC 2023

Hi all,

This pull request contains a backport of commit [3fe6e0fa](https://github.com/openjdk/jdk/commit/3fe6e0faca78e8106e33a3a53de78f8864be92b7) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Amit Kumar on 26 Sep 2023 and was reviewed by Lutz Schmidt and Martin Doerr.

Thanks!

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Commit messages:
 - Backport 3fe6e0faca78e8106e33a3a53de78f8864be92b7

Changes: https://git.openjdk.org/jdk21u/pull/330/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=330&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8308479
  Stats: 340 lines in 7 files changed: 206 ins; 21 del; 113 mod
  Patch: https://git.openjdk.org/jdk21u/pull/330.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/330/head:pull/330

PR: https://git.openjdk.org/jdk21u/pull/330