[vectorIntrinsics] RFR: 8265916: Add StoreVectorScatter nodes implementation for Arm SVE [v5]

[Wang Huang]

> * add `sve_st1w_scatter` and `sve_st1w_scatter`
> * implement `scatterI` and `scatterL`
> * `load gather partial` and `store scatter partial` are not contained in this patch, and they will be in next patches

Wang Huang has updated the pull request incrementally with one additional commit since the last revision:

  fix bugs

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Changes:
  - all: https://git.openjdk.java.net/panama-vector/pull/73/files
  - new: https://git.openjdk.java.net/panama-vector/pull/73/files/17154c45..952d20b3

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=73&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=73&range=03-04

  Stats: 8 lines in 2 files changed: 2 ins; 2 del; 4 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/73.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/73/head:pull/73

PR: https://git.openjdk.java.net/panama-vector/pull/73