RFR: 8347917: AArch64: Enable upper GPR registers in C1

[Andrew Haley]

On Thu, 16 Jan 2025 16:39:43 GMT, Andrew Haley <aph at openjdk.org> wrote:

> > As for the different allocation order (to prefer platform callee-saved registers), do you think something simple like last->first order will work for all platforms?
> 
> It might. It's certainly an interesting thing to try. I'm particularly interested because it potentially reduces the overhead for type checks.

Let's do this in a separate patch.

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PR Comment: https://git.openjdk.org/jdk/pull/23152#issuecomment-2614490296