RFR: 8259948: Aarch64: Add cast nodes for Aarch64 Neon backend [v5]

[Andrew Haley]

On Tue, 7 Sep 2021 10:11:08 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.
>
> Wang Huang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix bugs

src/hotspot/cpu/aarch64/aarch64_neon_ad.m4 line 233:

> 231:   match(Set dst (VectorCastB2X src));
> 232:   format %{ "sxtl    $dst, T8H, $src, T8B\n\t"
> 233:             "sxtl    $dst, T4S, $dst, T4H\n\t"

This whitespace change looks odd.

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