RFR: 8256245: AArch64: Implement Base64 decoding intrinsic [v7]

[Dong Bo]

On Thu, 8 Apr 2021 08:28:53 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> Dong Bo has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   reduce unnecessary memory write traffic in non-SIMD code
>
> Marked as reviewed by aph (Reviewer).

@theRealAph Thanks for the review.

Hi @nick-arm, are you also ok with the newest commit?

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PR: https://git.openjdk.java.net/jdk/pull/3228