RFR: 8291555: Implement alternative fast-locking scheme [v4]

[Robbin Ehn]

On Thu, 19 Jan 2023 12:09:27 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> > I always change the flags in code for the reasons David state and I can't forget to add any flags.
> > (Test batch is stilling running, no failures except MonitorInflationTest.java)
> 
> Ok, right.
> 
> I just re-ran tier1-3 with the flag changed in code, on aarch64 and x86_64 without regressions. Will run tier4 overnight.

I did a bigger batch of testing, there were some ThreadMXBean failures with wrong state. I'll investigate, otherwise passed.

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PR: https://git.openjdk.org/jdk/pull/10907