[vectorIntrinsics+compress] RFR: 8275231: Intrinsify VectorMask.compress API for X86 target.

[Jatin Bhateja]

On Thu, 21 Oct 2021 14:38:00 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

> Summary of changes:
> - Inline expansion of VectorMask.compress API.
> - X86 backend support for both AVX-512 and legacy targets.

Working on optimizing non-AVX512 performance  along with new perf tests for all 3 newly added APIs.
- VectorMask.compress
- Vector.compress
- Vector.expand

-------------

PR: https://git.openjdk.java.net/panama-vector/pull/156