RFR: 8259948: Aarch64: Add cast nodes for Aarch64 Neon backend [v3]

[Andrew Haley]

On Thu, 19 Aug 2021 03:54:10 GMT, Wu Yan <wuyan at openjdk.org> wrote:

>> src/hotspot/cpu/aarch64/aarch64_neon.ad line 430:
>> 
>>> 428:   %}
>>> 429:   ins_pipe(pipe_class_default);
>>> 430: %}
>> 
>> These VectorCast patterns should be combined.
>
> Sorry, what does "combine" mean. These VectorCast patterns are generated by https://github.com/openjdk/jdk/blob/aa4937cb012185425c852fe582aac41b6a477e77/src/hotspot/cpu/aarch64/aarch64_neon_ad.m4#L256 
> the code is already relatively concise.

Again, sorry.

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