RFR: 8344381: [s390x] Test failures with error: Register type is not known [v3]

[Amit Kumar]

On Tue, 19 Nov 2024 16:53:15 GMT, Lutz Schmidt <lucy at openjdk.org> wrote:

> > Looks correct to me. I would probably not exclude F1. But if the decision not to use it for allocation is fixed, ok. @RealLucy: Please take a 2nd look.
> 
> Wasn't F1 used as float function return value register? If so, exclusion is very helpful.

That is F0, I have added a screenshot up for such occasions🙃

Moreover `z_dbl_reg` class comments out `F1` register and `z_rscratch1_dbl_reg` class has not a single use. So seems like register allocator will never use `Z_F1`. That's why I excluded it.

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PR Comment: https://git.openjdk.org/jdk/pull/22197#issuecomment-2486282622