[vectorIntrinsics] RFR: Merge panama-vector:vector-unstable [v2]

[Ningsheng Jian]

> Merge openjdk/panama-vector:vector-unstable

Ningsheng Jian has refreshed the contents of this pull request, and previous commits have been removed. The incremental
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  Merge

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Changes:
  - all: https://git.openjdk.java.net/panama-vector/pull/4/files
  - new: https://git.openjdk.java.net/panama-vector/pull/4/files/bf3d59c4..e91da6c0

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=4&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=4&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/4.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/4/head:pull/4

PR: https://git.openjdk.java.net/panama-vector/pull/4