Tail-calling interpreter for GCC 15

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Feature or enhancement

Proposal:

Right now it's not at perf win at all to use the tail calling interpreter on GCC 15 due to no preserve_none calling convention. However, it's still a massively better debugging experience, and we should support GCC 15 to help them test out their musttail implementation anyways.

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

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Update: thanks to the awesome GCC devs, it seems that we don't need much changes to get this working!

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Building with GCC 15 on my computer. It seems no changes are needed to CPython to get this working.

So there's nothing we need to do :).