[vectorIntrinsics+fp16] RFR: 8290204: FP16 initial backend implementation [v4]

[Jatin Bhateja]

On Thu, 22 Dec 2022 20:45:32 GMT, Smita Kamath <svkamath at openjdk.org> wrote:

>> Initial backend implementation for enabling FP16.
>
> Smita Kamath has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Updated leaf level assembly routines as per review comment

Over all code looks clean, in absence of missing link b/w expanders and backend we cannot test it over SW emulator/HW.

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PR: https://git.openjdk.org/panama-vector/pull/204