Function norm_function 

pub fn norm_function(arch: &str) -> NormFunction

Which norm function arch applies, from the two capability lists that name the exceptions.

Both lists are consulted here and nowhere else, so an architecture on both would be answered ONE way rather than by whichever branch came first – and crate::loader’s the_norm_slot_and_function_lists_cannot_contradict pins that the situation never arises.