RFR: 8284960: Integration of JEP 426: Vector API (Fourth Incubator) [v6]

[Ningsheng Jian]

On Wed, 18 May 2022 23:22:42 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

> Interesting. But AArch64 code does cover vector cases which just adds confusion.

`UsePopCountInsturction` is always true in AArch64. @XiaohongGong removed the `predicate` in aarch64 rules, and I think we can even remove the option check in match_rule_supported().

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PR: https://git.openjdk.java.net/jdk/pull/8425