RFR: 8256431: [PPC64] Implement Base64 encodeBlock() for Power64-LE [v6]

[Michihiro Horie]

On Mon, 21 Dec 2020 16:19:53 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> Corey Ashford has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   stubGenerator_ppc.cpp: Improve readability of the vector constant initialization
>>   
>>   Use a struct of vectors instead of a large byte array, and make the C++
>>   compiler compute the offsets, using the offsetof() macro.
>
> Thanks for the improvements!

I reviewed all of your changes, which look good!

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PR: https://git.openjdk.java.net/jdk/pull/1245