[vectorIntrinsics+mask] RFR: 8272479: Java API and IR changes for masked rearrange operation [v2]

[Jatin Bhateja]

On Mon, 16 Aug 2021 08:13:32 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

>> - Re-organized the Java API implementation to use one common entry point of masked/non-masked vector compare operation.
>>  - Intrinsic side changes to absorb newly passed mask if target support predicated instructions else handled appropriately by blending full vector rearrange vector with broadcasted ZERO vector.
>
> Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8272479: Review comments resolution.

@PaulSandoz can you kindly review java side changes.

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PR: https://git.openjdk.java.net/panama-vector/pull/110