Built-in min/max functions

[Timmmm]

It would be nice if min/max worked out of the box. They're extremely common in signal widths, e.g. var foo: logic<max(N, M)>. I guess it's a bit tricky because of side effects, e.g. you can't compile it to M > N ? M : N because of max(print("hello"), print("world")) or whatever?