RFR: 8259948: Aarch64: Add cast nodes for Aarch64 Neon backend

[Andrew Haley]

On Tue, 20 Jul 2021 14:55:42 GMT, Wang Huang <whuang at openjdk.org> wrote:

> * In this issue, we plan to complete all missing implementation for aarch64 neon backend. For example, cast from Byte to Long, cast from Long to Byte, and so on.
> * It may be a solver of JDK-8269866, or part of it.

src/hotspot/cpu/aarch64/aarch64_neon_ad.m4 line 200:

> 198:   %}
> 199:   ins_pipe(pipe_slow);
> 200: %}

I'm sure you can find a more brief way to write these four patterns. Please do.

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PR: https://git.openjdk.java.net/jdk/pull/4839