Update skeleton

src/opt/gvn.rs

@@ -1,7 +1,7 @@
 use crate::opt::FunctionPass;
 use crate::*;
 
-pub type Gvn = FunctionPass<Repeat<GvnInner>>;
+pub type Gvn = FunctionPass<GvnInner>;
 
 #[derive(Default)]
 pub struct GvnInner {}

src/opt/opt_utils.rs

@@ -0,0 +1,3 @@
+//! Utilities for implementing optimizations.
+//!
+//! You can add here utilities commonly used in the implementation of multiple optimizations.