[master] RFR: Implement non-racy fast-locking [v5]

[Roman Kennke]

On Mon, 8 Aug 2022 07:32:53 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

> Funny, some of the code I "recognize" :)
> 
> There are some corner cases using this stack approach. I have some new tests and some old ones which I'll run, if they seem happy I can start reviewing.
> 
> Can you please run at least t4-t5 also.

BTW, where do I find tier5+ tests? OpenJDK only seems to have test groups up to tier4.

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PR: https://git.openjdk.org/lilliput/pull/51