RFR: 8271515: Integration of JEP 417: Vector API (Third Incubator) [v7]

[Paul Sandoz]

> This PR improves the performance of vector operations that accept masks on architectures that support masking in hardware, specifically Intel AVX512 and ARM SVE.
> 
> On architectures that do not support masking in hardware the same technique as before is applied to most operations, specifically composition using blend.
> 
> Masked loads/stores are a special form of masked operation that require additional care to ensure out-of-bounds access throw exceptions. The range checking has not been fully optimized and will require further work.
> 
> No API enhancements were required and only a few additional tests were needed.

Paul Sandoz has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 12 commits:

 - Merge branch 'master' into JDK-8271515-vector-api
 - Merge pull request #1 from nsjian/JDK-8271515
   
   Address AArch64 review comments from Nick.
 - Address review comments from Nick.
 - Merge branch 'master' into JDK-8271515-vector-api
 - Resolve review comments.
 - Merge branch 'master' into JDK-8271515-vector-api
 - Apply patch from https://github.com/openjdk/panama-vector/pull/152
 - Apply patch from https://github.com/openjdk/panama-vector/pull/142
 - Apply patch from https://github.com/openjdk/panama-vector/pull/139
 - Apply patch from https://github.com/openjdk/panama-vector/pull/151
 - ... and 2 more: https://git.openjdk.java.net/jdk/compare/9a3e9542...c9a77225

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Changes: https://git.openjdk.java.net/jdk/pull/5873/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5873&range=06
  Stats: 21966 lines in 104 files changed: 16193 ins; 2089 del; 3684 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5873.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5873/head:pull/5873

PR: https://git.openjdk.java.net/jdk/pull/5873