Fix for firrtl issue 459, reworking annotation API

tapeout/src/main/scala/transforms/ConvertToExtModPass.scala

@@ -31,6 +31,6 @@ class ConvertToExtMod(classify: (Module) => Boolean) extends Transform with Pass
   def passSeq = Seq(new ConvertToExtModPass(classify))
 
   def execute(state: CircuitState): CircuitState = {
-    CircuitState(runPasses(state.circuit), state.form)
+    state.copy(circuit = runPasses(state.circuit))
   }
 }

tapeout/src/main/scala/transforms/EnumerateModules.scala

@@ -27,6 +27,6 @@ class EnumerateModules(enumerate: (Module) => Unit) extends Transform with PassB
   def passSeq = Seq(new EnumerateModulesPass(enumerate))
 
   def execute(state: CircuitState): CircuitState = {
-    CircuitState(runPasses(state.circuit), state.form)
+    state.copy(circuit = runPasses(state.circuit))
   }
 }

tapeout/src/main/scala/transforms/ReParentCircuit.scala

@@ -21,6 +21,6 @@ class ReParentCircuit(newTopName: String) extends Transform with PassBased {
   def passSeq = Seq(new ReParentCircuitPass(newTopName))
 
   def execute(state: CircuitState): CircuitState = {
-    CircuitState(runPasses(state.circuit), state.form)
+    state.copy(circuit = runPasses(state.circuit))
   }
 }

tapeout/src/main/scala/transforms/RemoveUnusedModules.scala

@@ -54,6 +54,6 @@ class RemoveUnusedModules extends Transform with PassBased {
   def passSeq = Seq(new RemoveUnusedModulesPass)
 
   def execute(state: CircuitState): CircuitState = {
-    CircuitState(runPasses(state.circuit), state.form)
+    state.copy(circuit = runPasses(state.circuit))
   }
 }

tapeout/src/main/scala/transforms/RenameModulesAndInstances.scala

@@ -37,6 +37,6 @@ class RenameModulesAndInstances(rename: (String) => String) extends Transform wi
   def passSeq = Seq(new RenameModulesAndInstancesPass(rename))
 
   def execute(state: CircuitState): CircuitState = {
-    CircuitState(runPasses(state.circuit), state.form)
+    state.copy(circuit = runPasses(state.circuit))
   }
 }

tapeout/src/main/scala/transforms/ResetInverter.scala

@@ -48,9 +48,9 @@ class ResetInverterTransform extends Transform {
 
   override def execute(state: CircuitState): CircuitState = {
     getMyAnnotations(state) match {
-      case Nil => CircuitState(state.circuit, LowForm)
+      case Nil => state
       case Seq(ResetInverterAnnotation(ModuleName(state.circuit.main, CircuitName(_)))) =>
-        CircuitState(ResetN.run(state.circuit), LowForm)
+        state.copy(circuit = ResetN.run(state.circuit))
       case annotations =>
         throw new Exception(s"There should be only one InvertReset annotation: got ${annotations.mkString(" -- ")}")
     }