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

[Ningsheng Jian]

On Tue, 21 Sep 2021 12:08:25 GMT, Andrew Haley <aph at openjdk.org> wrote:

> One is _Advanced SIMD copy_, the other _Advanced SIMD scalar copy_. The _Advanced SIMD copy_ version is missing a comment to that effect. Maybe one day someone could go through assembler_aarch64.hpp and add the missing titles from the A64 instruction set encoding section of the ARM.

Yes, a comment will be helpful. But for the scalar copy, we should use SIMD_RegVariant instead of SIMD_Arrangement?

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