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

[Daniel D. Daugherty]

On Fri, 10 Feb 2023 17:15:53 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

>> Alan Bateman has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:
>> 
>>  - Remove include
>>  - Merge
>>  - Merge
>>  - Update copyright date
>>  - Initial commit
>
> src/hotspot/share/runtime/continuation.hpp line 42:
> 
>> 40: public:
>> 41:   static void init();
>> 42:   static bool enabled();
> 
> Based on the comment, I was expecting this line to be removed.
> I'll take it that there's still a way to disable Continuations even after virtual
> threads come out of "Preview"?
> 
> Update: I see the `VMContinuations` option is still present and experimental.
> When will it become non-experimental or removed?

And now I'm mulling why `VMContinuations` doesn't a default value...

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