RFR: 8301819: Enable continuations code by default [v3]

Fri Feb 10 17:34:25 UTC 2023

On Fri, 10 Feb 2023 17:19:20 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

>> And now I'm mulling why `VMContinuations` doesn't a default value...
>
> Ohhh... that's right. It's not implemented on all platforms yet... got it...

That's right. Additionally, the alternative implementation of virtual threads can be tested by running tests with -XX:-VMContinuations, and we have a few tests that do this.

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PR: https://git.openjdk.org/jdk/pull/12459