RFR: 8290082: [PPC64] ZGC C2 load barrier stub needs to preserve vector registers [v4]

[Martin Doerr]

On Tue, 12 Jul 2022 09:43:54 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> Preserve volatile vector registers in ZGC C2 load barrier stub.
>
> Martin Doerr has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:
> 
>  - Update SOE spec for VSR regs. Add comment to register_ppc.hpp
>  - Avoid using more than the volatile program storage (288 Bytes) on stack below the SP.
>  - 8290082: [PPC64] ZGC C2 load barrier stub needs to preserve vector registers

Thanks for the reviews! I just fixed a typo in a comment.

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PR: https://git.openjdk.org/jdk/pull/9453