[vectorIntrinsics] RFR: 8283709: Add x86 back-end implementation for bit BIT_COUNT operation [v7]

[Jatin Bhateja]

On Fri, 8 Apr 2022 20:37:54 GMT, Sandhya Viswanathan <sviswanathan at openjdk.org> wrote:

>> Yes, because this is predicated operation pattern and auto-vectorizer does not support predicate operation inferencing.
>
> The post loop work on the mainline would support the masked instructions generation.

Auto vectorizer restricts predication to load and store operations.

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PR: https://git.openjdk.java.net/panama-vector/pull/185