[vectorIntrinsics] RFR: 8283145: [vector] Add the compiler IR and aarch64 support for count leading and trailing zeros [v2]

[Jatin Bhateja]

On Thu, 17 Mar 2022 09:55:30 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
>
> Xiaohong Gong has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Address review comments in the aarch64 ad files

Common IR changes looks good to me.

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Marked as reviewed by jbhateja (Committer).

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