RFR: 8360405: [PPC64] some environments don't support mfdscr instruction [v3]

[Martin Doerr]

On Tue, 24 Jun 2025 18:53:17 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> Add back `has_mfdscr()` checks which were recently removed. See https://github.com/openjdk/jdk/pull/20262#issuecomment-2999872960
>
> Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Newline.

Thanks for the review! GHA and our internal tests have passed. We'll also need a JDK25 backport.

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PR Comment: https://git.openjdk.org/jdk/pull/25953#issuecomment-3003983656