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

[Amit Kumar]

On Tue, 7 Nov 2023 06:51:36 GMT, Amit Kumar <amitkumar at openjdk.org> wrote:

> 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!

Hi @TheRealMDoerr , would you please sponsor this PR. 

Thanks

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PR Comment: https://git.openjdk.org/jdk21u/pull/330#issuecomment-1803926581