RFR: 8345125: Aarch64: Add aarch64 backend for Float16 scalar operations [v4]

[Bhavana Kilambi]

On Fri, 25 Apr 2025 09:10:37 GMT, Andrew Haley <aph at openjdk.org> wrote:

> Looks good to me. Please summarize the tests that you've run before committing.

Thank you for the approval. 
All hotspot (hotspot_all), jdk (tiers 1-3) and langtools (tier1) pass on N1, V1 and V2 architectures.

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PR Comment: https://git.openjdk.org/jdk/pull/23748#issuecomment-2829847731