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

[Xiaohong Gong]

On Wed, 9 Mar 2022 16:21:36 GMT, Paul Sandoz <psandoz 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.

Yeah, since it checks the output of `-XX:+PrintOptoAssembly`, it can got the information from the "format" in a rule. I'v updated the test to check the SVE assembler codes. Thanks!

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