RFR: 8287437: Temporarily disable Continuations::enabled() for platforms which don't have an implementation, yet

[Aleksey Shipilev]

On Fri, 27 May 2022 11:56:52 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> Hello,
> 
> I'd like to disable `Continuations::enabled()` for platforms, which don't support Loom, yet. This enables working on Panama which is also controlled by `--enable-preview`.
> 
> I'm proposing this for all platforms which have an unresolved porting issue here:
> [JDK-8284161](https://bugs.openjdk.java.net/browse/JDK-8284161)
> 
> Please review and provide feedback if this makes sense for your platform.

That is actually a much better idea than chasing problemlists for x86_32!
I'd probably just define the platforms where Loom *is* implemented: `AMD64` and `AARCH64`.

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PR: https://git.openjdk.java.net/jdk/pull/8919