RFR: 8301819: Enable continuations code by default

[Alan Bateman]

On Thu, 9 Feb 2023 03:29:45 GMT, David Holmes <dholmes at openjdk.org> wrote:

> @AlanBateman I agree with enabling this and giving it time to bake. Vladimir has already checked there are no red flags on the performance front, so that is fine. If anything does arise we have, as you note, time to address it.

@kuksenko did a lot of detailed analysis on the performance, this lead to JDK-8300002 to account for the interaction between inlining and the post-call nops. We can re-visit again in a few weeks or months if something comes up.

> Copyright year needs updating in continuation.cpp.

Yes, will do.

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