[vectorIntrinsics] RFR: 8259536: Add cast nodes between interger types implementation for Arm SVE [v5]

[Wang Huang]

> This patch add cast nodes between interger types implementation for Arm SVE like  "VectorCastB2X" "VectorCastI2X " "VectorCastS2X" "VectorCastL2X".

Wang Huang has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains six commits:

 - Merge vectorIntrinsics
 - remove useless codes
 - remove walkaround codes
 - add other I2I cast nodes
 - fix build bug on other archs caused by UseSVE > 0
 - 8259536: Add cast nodes between interger types implementation for Arm SVE

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Changes: https://git.openjdk.java.net/panama-vector/pull/31/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=31&range=04
  Stats: 352 lines in 3 files changed: 342 ins; 10 del; 0 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/31.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/31/head:pull/31

PR: https://git.openjdk.java.net/panama-vector/pull/31