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

[Wu Yan]

On Wed, 22 Sep 2021 08:02:34 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> 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.

This whitespace is to align with the next instruction.

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