[vectorIntrinsics] RFR: 8265321: Add Rearrange nodes implementation for Arm SVE

[Wang Huang]

On Mon, 19 Apr 2021 07:17:29 GMT, Ningsheng Jian <njian at openjdk.org> wrote:

> I also prefer merging them instead of having two separate rules. From the instruction point of view, there's only D, not L.

Thank you for your review.

* I think that the comment is the node's comment (or rule's comment)  instead of single instruction's comment. This rule is `rearrangeL` which means rearranging long type so I think that the comment should be `L` instead of `D`.
* In `aarch64_neon.ad`, the comments are `B``I``F``D` and so on.

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PR: https://git.openjdk.java.net/panama-vector/pull/70