[vectorIntrinsics] RFR: Merge panama-vector:master

[Ningsheng Jian]

On Mon, 30 Nov 2020 22:29:00 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

> Merge master changes into vectorIntrinsics branch.
> 
> @nsjian I have probably got the aarch changes wrong, again!
>

Thanks! I re-generated the test code: https://github.com/PaulSandoz/panama-vector/pull/2

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PR: https://git.openjdk.java.net/panama-vector/pull/27