[vectorIntrinsics] RFR: 8264469: Add Insert float nodes implementation for Arm SVE [v4]

[Wang Huang]

> * Add Insert float nodes implementation for Arm SVE, like insertD & insertF
> * add fast path by using `cmpeq `(SVE compare vector with immediate). For the range limit of `imm5` is [-16, 15], I shift the index range from [0, 31] to [-16, 15].

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

  refact codes

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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/57fa497e..96983504

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=56&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=56&range=02-03

  Stats: 62 lines in 2 files changed: 31 ins; 0 del; 31 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