[vectorIntrinsics+compress] RFR: 8274992: Apply intrinsic for compress API

[Jatin Bhateja]

On Sat, 9 Oct 2021 07:55:16 GMT, Joshua Zhu <jzhu at openjdk.org> wrote:

> This is my last local change for compress API.
> After applying this change, all VectorAPI jtreg tests passed in my local environment.
> My machine is Intel skylake, hence no AVX512 vbmi2 support.
> Also due to lack of expand backend support in my change, therefore the jtreg tests covered:
>     * compress java and intrinsic implementation for INT, FLOAT, LONG DOUBLE
>     * compress java implementation for BYTE, SHORT
>     * expand java implementation

@sviswa7 , @JoshuaZhuwj . This is an overlapping changes with PR 146 which is yet to be integrated.

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PR: https://git.openjdk.java.net/panama-vector/pull/150