RFR: 8259948: Aarch64: Add cast nodes for Aarch64 Neon backend [v2]

[Wu Yan]

On Wed, 4 Aug 2021 10:08:47 GMT, Andrew Haley <aph at openjdk.org> wrote:

> The big question for all of this is: what is the test coverage?

We tested the following two test cases:
test/hotspot/jtreg/compiler/vectorapi/VectorCastShape128Test.java
test/hotspot/jtreg/compiler/vectorapi/VectorCastShape64Test.java

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