RFR: 8259822: [PPC64] Support the prefixed instruction format added in POWER10 [v2]

[Kazunori Ogata]

On Thu, 21 Jan 2021 01:53:02 GMT, Corey Ashford <github.com+51754783+CoreyAshford at openjdk.org> wrote:

>> Kazunori Ogata has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Update based on review comments
>
> This looks good overall.  I'm looking forward to being able to utilize this capability.

@CoreyAshford Thank you very much for your review.  I updated my patch based on your comment.  For some comments that I left unchanged, I replied to each of them.  Please give me your thought.

For merge conflict, I verified the conflict is only the copyright years.  I'll fix it when real changes are reviewed because pulling the latest master to resolve conflict makes this patch difficult to review.

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PR: https://git.openjdk.java.net/jdk/pull/2095