RFR: 8286446: PPC64: fix crashes after JDK-8284161 (virtual threads preview) [v3]

[Richard Reingruber]

On Wed, 11 May 2022 08:54:05 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> So I've merged master after #8631 and implemented `generate_jfr_write_checkpoint()`. Unfortunately I wasn't able to test anything except building since the ppc servers I normally use are not accessible since yesterday. C'est la vie...
>
>> So I've merged master after #8631 and implemented `generate_jfr_write_checkpoint()`. Unfortunately I wasn't able to test anything except building since the ppc servers I normally use are not accessible since yesterday. C'est la vie...
> 
> Should be fine.

Thanks for reviewing @shipilev !
I just found a server where I've successfully tested `java -version`.
I guess this is ready for integration. @TheRealMDoerr you might want to have a quick look at `generate_jfr_write_checkpoint()` before.

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