RFR: 8359232: [PPC64] C2: Clean up ppc.ad: add instr sizes, remove comments [v2]

[David Briemann]

On Wed, 11 Jun 2025 12:40:05 GMT, David Briemann <dbriemann at openjdk.org> wrote:

>> Add missing sizes for some instructions.
>> Clean up outdated Power7 comments.
>
> David Briemann has updated the pull request incrementally with one additional commit since the last revision:
> 
>   re-add deleted token

Thanks for the review!

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PR Comment: https://git.openjdk.org/jdk/pull/25752#issuecomment-2966724502