RFR: 8355391: Use Long::hashCode in java.time

[duke]

On Wed, 30 Apr 2025 06:46:07 GMT, Volkan Yazici <vyazici at openjdk.org> wrote:

> Replace manual bitwise operations in `hashCode` implementations of `java.time` with `Long::hashCode`.

@vy 
Your change (at version 891d9ada7ce6860ea8e1253021f04053cc27090a) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk/pull/24959#issuecomment-2842821265