[vectorIntrinsics] RFR: 8254826: Add reduction nodes implementation for Arm SVE

[Dongbo He]

Contributed-by: wanghuang3 at huawei.com, hexuejin2 at huawei.com

Add reduction nodes support for Arm SVE. Add the backend codegen for nodes like "AndReductionVNode" "OrReductionVNode"
"XorReductionVNode" "MaxReductionVNode" "MinReductionVNode" .

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Commit messages:
 - 8254826: Add reduction nodes implementation for Arm SVE

Changes: https://git.openjdk.java.net/panama-vector/pull/13/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=13&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254826
  Stats: 616 lines in 2 files changed: 603 ins; 10 del; 3 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/13.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/13/head:pull/13

PR: https://git.openjdk.java.net/panama-vector/pull/13