[vectorIntrinsics] RFR: 8266286: Add LoadVectorGather and StoreVectorScatter's partial version

[Xiaohong Gong]

On Mon, 31 May 2021 07:20:20 GMT, Wang Huang <whuang at openjdk.org> wrote:

> * Add LoadVectorGather and StoreVectorScatter's partial version
> *  use `sve_whilelo`

Tests pass with SVE 512 vector length. So looks good to me. Thanks!

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Marked as reviewed by xgong (Committer).

PR: https://git.openjdk.java.net/panama-vector/pull/88