RFR: 8329749: Obsolete the unused UseNeon flag [v3]

[Andrew Haley]

On Mon, 8 Apr 2024 05:42:20 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> After [JDK-8328264](https://bugs.openjdk.org/browse/JDK-8328264), the UseNeon flag is only used by JVMCI code and @dougxc confirmed that it can be removed.
>> 
>> Thanks,
>> Tobias
>
> Tobias Hartmann has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Removed UseNeon from AArch64.java

Marked as reviewed by aph (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/18648#pullrequestreview-1985908008