Move barstools tapeout src to tools/tapeout

tools/tapeout/src/main/scala/transforms/ExtraTransforms.scala

@@ -0,0 +1,26 @@
+// See LICENSE for license details.
+
+package barstools.tapeout.transforms
+
+import firrtl.Mappers._
+import firrtl._
+import firrtl.annotations.{CircuitTarget, ModuleTarget, SingleTargetAnnotation}
+import firrtl.ir._
+import firrtl.stage.Forms
+import firrtl.stage.TransformManager.TransformDependency
+import firrtl.options.{Dependency}
+
+class ExtraLowTransforms extends Transform with DependencyAPIMigration {
+  // this PropagatePresetAnnotations is needed to run the RemoveValidIf pass (that is removed from CIRCT).
+  // additionally, since that pass isn't explicitly a prereq of the LowFormEmitter it
+  // needs to wrapped in this xform
+  override def prerequisites: Seq[TransformDependency] = Forms.LowForm :+
+    Dependency[firrtl.transforms.PropagatePresetAnnotations]
+  override def optionalPrerequisites:  Seq[TransformDependency] = Forms.LowFormOptimized
+  override def optionalPrerequisiteOf: Seq[TransformDependency] = Forms.LowEmitters
+  override def invalidates(a: Transform): Boolean = false
+
+  def execute(state: CircuitState): CircuitState = {
+    state
+  }
+}