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

[Ningsheng Jian]

> Tested with tier1 and jdk:tier3 (with jdk/incubator/vector), no new failure.

Ningsheng Jian has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 695 commits:

 - Merge panama-vector:master
   
   Tested tier1 and jdk:tier3 without new failure.
 - 8262275: Math vector stubs are not called for double64 vectors
   
   Reviewed-by: sviswanathan
 - 8262498: More than 50% performance degradation of pow operator due to call with svml intrinsic after JDK-8261267
   
   Reviewed-by: sviswanathan
 - 8262492: Add cast nodes between float types implementation for Arm SVE
   
   Co-authored-by: Wang Huang <whuang at openjdk.org>
   Co-authored-by: He Xuejin <hexuejin2 at huawei.com>
   Co-authored-by: Ai Jiaming <aijiaming1 at huawei.com>
   Reviewed-by: njian
 - 8261108: Add cast nodes from integer types to float types implementation for Arm SVE
   
   Co-authored-by: He Xuejin <hexuejin2 at huawei.com>
   Co-authored-by: Ai Jiaming <aijiaming1 at huawei.com>
   Co-authored-by: Wang Huang <whuang at openjdk.org>
   Reviewed-by: njian
 - 8261394: [vector] Crash with "assert(Matcher::vector_size_supported(elem_bt, length)) failed: length in range"
   
   Reviewed-by: njian, jiefu, sviswanathan
 - Merge panama-vector:master
   
   Reviewed-by: sviswanathan, xgong
 - 8261267: Math vector stubs are not called from jitted code
   
   Reviewed-by: vlivanov
 - 8259536: Add cast nodes between interger types implementation for Arm SVE
   
   Reviewed-by: njian, xgong
 - 8260668: vectorIntrinsics windows build problem
   
   Reviewed-by: ihse, psandoz
 - ... and 685 more: https://git.openjdk.java.net/panama-vector/compare/d91550ef...375ba645

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Changes: https://git.openjdk.java.net/panama-vector/pull/43/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=43&range=01
  Stats: 486683 lines in 312 files changed: 486185 ins; 191 del; 307 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/43.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/43/head:pull/43

PR: https://git.openjdk.java.net/panama-vector/pull/43