[vectorIntrinsics+compress] RFR: 8274889: Intrinsify Vector.expand/compress APIs for X86 [v3]

[Jatin Bhateja]

On Fri, 8 Oct 2021 13:12:40 GMT, Joshua Zhu <jzhu at openjdk.org> wrote:

>> Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   8274889: Post merge IR cleanup and special case handling for allTrue mask.
>
> Part of review comments. Will add more.

Thanks @JoshuaZhuwj  and @sviswa7 , your comments have been addressed.

I have backed out generic handling based on background vectors (ZERO or user supplied vector) since @sviswa7 removed two APIs expand(m, v) and compress(m, v) in her previous patch.

Please let me know if its ok to integrate it now.

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PR: https://git.openjdk.java.net/panama-vector/pull/146