Working branching.

src/main/scala/EXBarrier.scala

@@ -20,9 +20,12 @@ class EXBarrier extends MultiIOModule {
     new Bundle {
       val in = Input(new EXBarrierIO)
       val out = Output(new EXBarrierIO)
+      val flush = Output(Bool())
     })
 
   val delay = Reg(new EXBarrierIO)
   delay := io.in
   io.out := delay
+
+  io.flush := io.in.branch
 }