[vectorIntrinsics] RFR: 8283145: [vector] Add the compiler IR and aarch64 support for count leading and trailing zeros

[Xiaohong Gong]

On Thu, 17 Mar 2022 02:22:09 GMT, Xiaohong Gong <xgong at openjdk.org> wrote:

> This patch adds the hotspot compiler implementations for the vector operations of count leading and trailing zeros. It adds:
>  - two vector nodes respectively for the two vector operations
>  - the backend implementations for aarch64 NEON and SVE

Thanks for your review @nsjian ! The comments have been addressed. Thanks!

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PR: https://git.openjdk.java.net/panama-vector/pull/180