gh-139653: If platform API doesn't give the current stack, use generic fallback #139667
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Fall back to
_Py_get_machine_stack_pointerif platform-specific API doesn't give us a stack that we're currently in. This might happen if some bespoke stack switching mechanism is in use.With this, gh-139653 should be solved if the user calls
_Py_InitializeRecursionLimitsafter eachjump_fcontext.