RFR: 8289613: Drop use of Thread.stop in jshell [v4]

[Alan Bateman]

On Thu, 8 Sep 2022 08:34:59 GMT, Adam Sotona <asotona at openjdk.org> wrote:

> According to javadoc VarHandle of static field "effectively ignore the volatile declaration".
> Volatility of REPL.$Cancel.allStop field is critical for this use case.

VarHandles defines xxxVolatile so it would be feasible but I don't see a strong need to change it as the reflective op is only done at the start to reset "stop" and when control-C/stop is done.

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PR: https://git.openjdk.org/jdk/pull/10166