[jdk20] RFR: 8298225: [AIX] Disable PPC64LE continuations on AIX

[Tyler Steele]

On Thu, 8 Dec 2022 18:56:10 GMT, Tyler Steele <tsteele at openjdk.org> wrote:

> This small change adds an import to ppc.ad to allow it to find Contiuations::enabled, and sets VMContinuations to false on AIX.
> 
> Thanks to @TheRealMDoerr for suggestions to a previous version of this PR.

Thanks for the reviews!

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> My recommendation for tracking down issues would be test/jdk/jdk/internal/vm/Continuation/BasicExt.java with -Xlog:continuations=trace switched on.

and

> Do you know what's wrong on that OS? I believe there's not much missing. I recommend trying test/jdk/java/lang/Thread/virtual/stress tests and debugging it on linux PPC64 Big Endian.

Thanks for the suggestions, I think they will help :-). I have been examining the failures, but not with continuations=trace, and on AIX rather than Linux/PPC64 big-endian. All in all, I am surprised at how well Richard's changes for PPC64-LE are working in a different ABI than they were implemented for. We'll see how much progress I can make before 19 Jan :crossed_fingers:

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PR: https://git.openjdk.org/jdk20/pull/4