RFR: 8256318: AArch64: Add support for floating-point absolute difference [v5]

[Dong Bo]

On Wed, 18 Nov 2020 09:32:45 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> Dong Bo has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   add match rules back for AbsVB with vector length 4
>
> Marked as reviewed by aph (Reviewer).

@theRealAph @nsjian Thanks for the review.

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PR: https://git.openjdk.java.net/jdk/pull/1215