[vectorIntrinsics] RFR: Merge panama-vector:master

[Ningsheng Jian]

On Thu, 19 Nov 2020 23:31:04 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

> @nsjian I have almost certainly got the aarch64 changes wrong to that file which tests instructions for a debug build. Can you help with this? We can update the PR or we can integrate this PR as is, then follow up with a new PR with specific changes.

I will take a look later today.

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PR: https://git.openjdk.java.net/panama-vector/pull/25