[vectorIntrinsics] RFR: 8264469: Add Insert float nodes implementation for Arm SVE [v2]

[Wang Huang]

> Add Insert float nodes implementation for Arm SVE, like insertD & insertF

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

  add fast path

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Changes:
  - all: https://git.openjdk.java.net/panama-vector/pull/56/files
  - new: https://git.openjdk.java.net/panama-vector/pull/56/files/cf86ee00..dafe3ed7

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=56&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=56&range=00-01

  Stats: 277 lines in 3 files changed: 205 ins; 14 del; 58 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/56.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/56/head:pull/56

PR: https://git.openjdk.java.net/panama-vector/pull/56