Remove an unused argument.

lib/cretonne/src/context.rs

@@ -191,7 +191,7 @@ impl Context {
 
     /// Perform simple GVN on the function.
     pub fn simple_gvn<'a, FOI: Into<FlagsOrIsa<'a>>>(&mut self, fisa: FOI) -> CtonResult {
-        do_simple_gvn(&mut self.func, &mut self.cfg, &mut self.domtree);
+        do_simple_gvn(&mut self.func, &mut self.domtree);
         self.verify_if(fisa)
     }
 

lib/cretonne/src/simple_gvn.rs

@@ -1,7 +1,6 @@
 //! A simple GVN pass.
 
 use cursor::{Cursor, FuncCursor};
-use flowgraph::ControlFlowGraph;
 use dominator_tree::DominatorTree;
 use ir::{InstructionData, Function, Inst, Opcode, Type};
 use scoped_hash_map::ScopedHashMap;
@@ -17,9 +16,8 @@ fn trivially_unsafe_for_gvn(opcode: Opcode) -> bool {
 
 /// Perform simple GVN on `func`.
 ///
-pub fn do_simple_gvn(func: &mut Function, cfg: &mut ControlFlowGraph, domtree: &mut DominatorTree) {
+pub fn do_simple_gvn(func: &mut Function, domtree: &mut DominatorTree) {
     let _tt = timing::gvn();
-    debug_assert!(cfg.is_valid());
     debug_assert!(domtree.is_valid());
 
     let mut visible_values: ScopedHashMap<(InstructionData, Type), Inst> = ScopedHashMap::new();