RFR: 8259948: Aarch64: Add cast nodes for Aarch64 Neon backend [v4]

[Wu Yan]

On Tue, 10 Aug 2021 09:16:51 GMT, Andrew Haley <aph at openjdk.org> wrote:

>>> Does your testing cover all that is added in this patch? If so, how did you ascertain it?
>> 
>> Yes,  These two test cases have covered the code in the patch.  First, I unmark the unsupported opcodes in JDK-8268966. Then I test the cases in both of the above test files one by one, implementing the rules once the testcase failed until all the testcases pass.
>
>> > Does your testing cover all that is added in this patch? If so, how did you ascertain it?
>> 
>> Yes, These two test cases have covered the code in the patch. First, I unmark the unsupported opcodes in JDK-8268966. Then I test the cases in both of the above test files one by one, implementing the rules once the testcase failed until all the testcases pass.
> 
> OK.

Could you do me a favor to review the patch? @theRealAph @nick-arm Thank you.

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