[vectorIntrinsics] RFR: Compress/expand op spec.

[Jatin Bhateja]

On Thu, 21 Apr 2022 19:24:14 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

> Update the compress/expand operator specification.
> 
> I have retained the "_BITS" qualifier so as to more clearly differentiate from the method names, `compress` and `expand`, for the cross-lane compress and expand operations.

Marked as reviewed by jbhateja (Committer).

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PR: https://git.openjdk.java.net/panama-vector/pull/196