small stuff

src/backend/ir/mod.rs

@@ -24,7 +24,10 @@ pub struct Func<A: Arch> {
 }
 
 pub enum Instr<A: Arch> {
+    Set { dst: VarId, src: Vec<u8> },
+    Call { dst: FnId, args: Vec<VarId> },
     Copy { dst: VarId, src: VarId },
+    Free(VarId),
     Asm(A::Asm),
 }