[vectorIntrinsics] RFR: 8259536: Add cast nodes between interger types implementation for Arm SVE [v3]

[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 incrementally with one additional commit since the last revision:

  add other I2I cast nodes

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Changes:
  - all: https://git.openjdk.java.net/panama-vector/pull/31/files
  - new: https://git.openjdk.java.net/panama-vector/pull/31/files/db8e148d..2a6df4e1

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=31&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=31&range=01-02

  Stats: 130 lines in 3 files changed: 126 ins; 0 del; 4 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