re-export SwitchIntEdgeEffects
re-export SwitchIntEdgeEffects

This makes it possible to use `switch_int_edge_effects` outside
`rustc_mir::dataflow::impls`.

aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust