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

[Jatin Bhateja]

On Thu, 7 Oct 2021 23:41:16 GMT, Sandhya Viswanathan <sviswanathan at openjdk.org> wrote:

>> - Common C2 compiler entry point for compress/expand APIs.
>> - Inline expansion handling and C2 graph creation.
>> - For X86 current backed support is added for AVX512 which offers direct compress/expand instructions.
>> 
>> Patch has been co-contributed by  Joshua Zhu  (@Alibaba)
>
> @jatin-bhateja Thanks for looking into this. Unfortunately some of this overlaps with Joshua's submission. Please co-ordinate with Joshua.

@sviswa7 , updated the pull request with incremental changes as suggested by @JoshuaZhuwj

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