Support delete unused in scheduler

Supports delete unused in the pass manager. This actually makes delete unused its own expression form rather than a pass since that avoids having to pass additional (otherwise unnecessary) state into the run_pass function.

juno_scheduler/src/compile.rs

@@ -73,6 +73,9 @@ struct MacroInfo {
 
 enum Appliable {
     Pass(ir::Pass),
+    // DeleteUncalled requires special handling because it changes FunctionIDs, so it is not
+    // treated like a pass
+    DeleteUncalled,
     Schedule(Schedule),
     Device(Device),
 }
@@ -81,7 +84,7 @@ impl Appliable {
     fn num_args(&self) -> usize {
         match self {
             Appliable::Pass(pass) => pass.num_args(),
-            // Schedules and devices do not arguments (at the moment)
+            // Delete uncalled, Schedules, and devices do not take arguments
             _ => 0,
         }
     }
@@ -97,7 +100,7 @@ impl FromStr for Appliable {
             "ccp" => Ok(Appliable::Pass(ir::Pass::CCP)),
             "crc" | "collapse-read-chains" => Ok(Appliable::Pass(ir::Pass::CRC)),
             "dce" => Ok(Appliable::Pass(ir::Pass::DCE)),
-            "delete-uncalled" => Ok(Appliable::Pass(ir::Pass::DeleteUncalled)),
+            "delete-uncalled" => Ok(Appliable::DeleteUncalled),
             "float-collections" | "collections" => Ok(Appliable::Pass(ir::Pass::FloatCollections)),
             "fork-guard-elim" => Ok(Appliable::Pass(ir::Pass::ForkGuardElim)),
             "fork-split" => Ok(Appliable::Pass(ir::Pass::ForkSplit)),
@@ -323,6 +326,11 @@ fn compile_expr(
                     args: arg_vals,
                     on: selection,
                 })),
+                Appliable::DeleteUncalled => {
+                    Ok(ExprResult::Expr(ir::ScheduleExp::DeleteUncalled {
+                        on: selection,
+                    }))
+                }
                 Appliable::Schedule(sched) => Ok(ExprResult::Stmt(ir::ScheduleStmt::AddSchedule {
                     sched,
                     on: selection,