RFR: 8259822: [PPC64] Support the prefixed instruction format added in POWER10 [v8]

[Kazunori Ogata]

On Thu, 25 Mar 2021 10:50:45 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> Kazunori Ogata has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Clean up compute_padding() and fix grammatical errors
>
> Looks good to me, now. Is the latest version substantially tested? We need to rely on IBMs testing because nobody else has Power10.

@TheRealMDoerr  I verified there was no additional errors against the base version in DaCapo, Renaissance, and SPECjbb2015.  Altough some tests in DaCapo and Renaissance (e.g., DaCapo eclipse and tradesoap and Renaissance db-shootout) failed in the modified version, they also failed in the base build with the same error.

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