Fix the issue of duplicate unique ID for atoms using newtype.

The MergeFunctionsPass in LLVM merges identical functions (https://rust.godbolt.org/z/3nnr9nMne), resulting in the same function addresses.

packages/fermi/src/atoms/atomref.rs

@@ -2,24 +2,24 @@ use crate::{AtomId, AtomRoot, Readable};
 use std::cell::RefCell;
 
 pub struct AtomRefBuilder;
-pub type AtomRef<T> = fn(AtomRefBuilder) -> T;
+pub struct AtomRef<T>(pub fn(AtomRefBuilder) -> T);
 
-impl<V> Readable<RefCell<V>> for AtomRef<V> {
+impl<V> Readable<RefCell<V>> for &'static AtomRef<V> {
     fn read(&self, _root: AtomRoot) -> Option<RefCell<V>> {
         todo!()
     }
 
     fn init(&self) -> RefCell<V> {
-        RefCell::new((*self)(AtomRefBuilder))
+        RefCell::new(self.0(AtomRefBuilder))
     }
 
     fn unique_id(&self) -> AtomId {
-        *self as *const ()
+        *self as *const AtomRef<V> as *const ()
     }
 }
 
 #[test]
 fn atom_compiles() {
-    static TEST_ATOM: AtomRef<Vec<String>> = |_| vec![];
-    dbg!(TEST_ATOM.init());
+    static TEST_ATOM: AtomRef<Vec<String>> = AtomRef(|_| vec![]);
+    dbg!((&TEST_ATOM).init());
 }