Error out in donation if:
1) input layout is AUTO and output layout is not AUTO (i.e. default or concrete)
2) input layout is not AUTO (i.e. default or concrete) and output layout is AUTO
This is because there is a conflict in such cases and almost always leads to the wrong layout being chosen by the compiler. For example, let's talk about (1): since input layout is AUTO and output layout is default and since they are aliased, XLA will end up choose default layout for input which is not what you want in majority of the cases.
Erroring is best in such cases and the user can mark the input layout to be default if they want to do that.
The correct choice is to always make both of them AUTO since you want the compiler to choose the best possible layout instead of choosing the input or output layout if the other one is AUTO.
PiperOrigin-RevId: 683688470
