RFR: 8223347: Integration of Vector API (Incubator)

[Paul Sandoz]

This pull request is for integration of the Vector API. It was previously reviewed under conditions when mercurial was
used for the source code control system. Review threads can be found here (searching for issue number 8223347 in the
title):

https://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2020-April/thread.html
https://mail.openjdk.java.net/pipermail/core-libs-dev/2020-May/thread.html
https://mail.openjdk.java.net/pipermail/core-libs-dev/2020-July/thread.html

If mercurial was still being used the code would be pushed directly, once the CSR is approved. However, in this case a
pull request is required and needs explicit reviewer approval. Between the final review and this pull request no code
has changed, except for that related to merging.

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Commit messages:
 - Fix permissions
 - Fix permissions
 - Merge master
 - Vector API new files
 - Integration of Vector API (Incubator)

Changes: https://git.openjdk.java.net/jdk/pull/367/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=367&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8223347
  Stats: 295107 lines in 336 files changed: 292957 ins; 1062 del; 1088 mod
  Patch: https://git.openjdk.java.net/jdk/pull/367.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/367/head:pull/367

PR: https://git.openjdk.java.net/jdk/pull/367