[vectorIntrinsics+mask] RFR: 8272100: VectorAPI: modify existing implementation of masked neg and not operation.

[Xiaohong Gong]

On Fri, 6 Aug 2021 17:36:26 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

> - Masked NEG/NOT operations can be implemented using existing masked operations instead of emitting an explicit vector blend after the operation. 
> - Changes shows around 1.3-1.5X gain when merged with X86 backend changes for masking operations. https://github.com/openjdk/panama-vector/pull/99

LGTM, thanks!

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Marked as reviewed by xgong (Committer).

PR: https://git.openjdk.java.net/panama-vector/pull/108