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When detecting stack overflow in the kernel exception handler, use `SP_EL0`, rather than `TPIDR_EL1` as the scratch register. This allows us to use the `TPIDR_EL1` register as a CPU-banked register for other purposes. Use of `SP_EL0` is safe here since the stack overflow check occurs during kernel exceptions and SP_EL0 will be restored by the user-space context restore logic, overriding the clobber.