RFR: 8282431: AArch64: Add optimized rules for masked vector multiply-add/sub for SVE

[Paul Sandoz]

On Wed, 9 Mar 2022 09:21:54 GMT, Xiaohong Gong <xgong at openjdk.org> wrote:

> And I misunderstood that the ir framework can only check the C2 IR nodes. Seems it can also check the assembly codes.

To be honest I was uncertain if the ir framework could do this. Worth investigating.

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PR: https://git.openjdk.java.net/jdk/pull/7737