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

[Wang Huang]

On Thu, 1 Apr 2021 08:06:35 GMT, Ningsheng Jian <njian at openjdk.org> wrote:

> Maybe you can check whether idx is in CMPEQ imm range to generate different code?

I add a fast path by using `CMPEQ imm`. 

I shift the range of idx from [0,31] to [-16,15] to suit the range limit of `imm5`.

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