RFR: 8340623: Remove outdated PROCESSOR_ARCHITECTURE_IA64 from Windows coding

[David Holmes]

On Mon, 23 Sep 2024 08:05:55 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> We still check for PROCESSOR_ARCHITECTURE_IA64 but this is not supported any more for a very long time in OpenJDK.

Filed [JDK-8340731](https://bugs.openjdk.org/browse/JDK-8340731) for HS cleanup

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PR Comment: https://git.openjdk.org/jdk/pull/21130#issuecomment-2370355272