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

[Ningsheng Jian]

> Resolved some conflicts on AArch64. Vector api tests passed on both aarch64 and x86.

Ningsheng Jian has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 730 commits:

 - Merge panama-vector/master into vectorIntrinsics
 - 8269264: Some more cleanups for Vector API SVE support
   
   Reviewed-by: xgong
 - Merge panama-vector:master
   
   Co-authored-by: Ningsheng Jian <njian at openjdk.org>
 - 8244490: [vector] Move Vector API micro benchmarks under test/micro
   
   Reviewed-by: psandoz
 - 8266286: Add LoadVectorGather and StoreVectorScatter's partial version
   
   Co-authored-by: Wang Huang <whuang at openjdk.org>
   Co-authored-by: Ai Jiaming <aijiaming1 at huawei.com>
   Reviewed-by: xgong, njian
 - Merge panama-vector:master
   
   Reviewed-by: sviswanathan
 - 8267224: Vector API SVE codegen cleanups
   
   Reviewed-by: xgong
 - 8266775: Add VectorLoadConst node implementation for Arm SVE
   
   Co-authored-by: Wang Huang <whuang at openjdk.org>
   Co-authored-by: Ai Jiaming <aijiaming1 at huawei.com>
   Reviewed-by: xgong, njian
 - Correct specification for length-invariance.
   
   Reviewed-by: sviswanathan
 - Merge panama-vector:master
 - ... and 720 more: https://git.openjdk.java.net/panama-vector/compare/e7cdfebb...13382321

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Changes: https://git.openjdk.java.net/panama-vector/pull/98/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=98&range=01
  Stats: 72643 lines in 110 files changed: 71513 ins; 204 del; 926 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/98.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/98/head:pull/98

PR: https://git.openjdk.java.net/panama-vector/pull/98