[vectorIntrinsics] RFR: 8285281: [x86] Add C2 mid-end and back-end implementation for COMPRESS_BITS and EXPAND_BITS operations [v3]

[Jatin Bhateja]

On Fri, 6 May 2022 07:13:43 GMT, Xiaohong Gong <xgong at openjdk.org> wrote:

>> Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   8285281: Review comments resolved.
>
> Please don't forget to add the new added vector ops like `CompressBitsV` and `ExpandBitsV` to function https://github.com/openjdk/jdk/blob/master/src/hotspot/share/adlc/formssel.cpp#L4208. Or the vector type info might be missing by matcher as expected. Thanks!

Thanks @XiaohongGong , @theRealELiu for reviews.

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PR: https://git.openjdk.java.net/panama-vector/pull/195