RFR: 8363943: ARM32: Represent Registers as values

[Sergey Nazarkin]

On Tue, 29 Jul 2025 06:46:56 GMT, Ivan <duke at openjdk.org> wrote:

> Migrate away from pointer-based representation of Register values.
> 
> It improves compile-time checking by forbidding implicit conversions between integrals and pointers.
> 
> [JDK-8363943](https://bugs.openjdk.org/browse/JDK-8363943)

@bobvandette @shipilev Could you please review these changes? They are critical for the ARM32 port, which crashes if it is built with one of the latest versions of GCC.

@bulasevich you might be interested in this too.

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PR Comment: https://git.openjdk.org/jdk/pull/26525#issuecomment-3510493435
PR Comment: https://git.openjdk.org/jdk/pull/26525#issuecomment-3510499550