RFR: 8286446: PPC64: fix crashes after JDK-8284161 (virtual threads preview) [v2]

[Richard Reingruber]

On Tue, 10 May 2022 12:45:27 GMT, Richard Reingruber <rrich at openjdk.org> wrote:

>> With this change `java -version` succeeds with the devkit build also the standard build on a ppc64le box does not crash anymore.
>> 
>> Also tier1 tests don't look too bad.
>
> Richard Reingruber has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Martin's feedback

Thanks for making me aware of #8631 @mgronlun and @shipilev.
I'm working on it.
Should I actually rebase the branch underlying the pr or should I merge master into it?

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PR: https://git.openjdk.java.net/jdk/pull/8617