Moved things around a bit.

src/backend/mod.rs

@@ -0,0 +1,5 @@
+//! Backend: IR to Wasm.
+
+mod stackify;
+pub(crate) use stackify::*;
+

src/backend/stackify.rs

@@ -1,4 +1,5 @@
-//! IR-to-Wasm transform.
+//! Stackifier-like algorithm to recover (or create) structured
+//! control flow out of a CFG.
 
 use crate::{cfg::CFGInfo, ir::*};
 use log::debug;
@@ -210,3 +211,5 @@ impl Shape {
         Shape::None
     }
 }
+
+