RFR: 8269725: AArch64: Add VectorMask query implementation for NEON [v5]

[Xiaohong Gong]

On Wed, 14 Jul 2021 12:46:34 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> The main reason is the argument difference that `vmask_firsttrue_LT8B` needs to clear the `rFlagsReg` while `vmask_firsttrue8B`. It doesn't matter too much if the rule always clear the flag, right？
>
> It doesn't much matter, no, but being able to make differences like this without cut-and-paste programming is why we have a macro processor. Your call.

Hi @theRealAph , the latest commit has merged these two rules into a macro processor. Could you please to see whether it makes sense to you? Thanks so much!

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PR: https://git.openjdk.java.net/jdk/pull/4699