Modify and optimize performance of propagate annotations (#2393)

* Change AnnotationSeq underlying from List to Seq

It was nothing but pointless copying.

* Make propagateAnnotations faster

There was lots of expensive logic for very little benefit.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/main/scala/firrtl/transforms/DedupAnnotations.scala b/src/main/scala/firrtl/transforms/DedupAnnotations.scala
index cad4d2be..9aad2fee 100644
--- a/src/main/scala/firrtl/transforms/DedupAnnotations.scala
+++ b/src/main/scala/firrtl/transforms/DedupAnnotations.scala
@@ -95,7 +95,7 @@ class DedupAnnotationsTransform extends Transform with DependencyAPIMigration {
   def execute(state: CircuitState): CircuitState = CircuitState(
     state.circuit,
     state.form,
-    DedupAnnotationsTransform.dedupAnnotations(state.annotations.underlying, InstanceKeyGraph(state.circuit)),
+    DedupAnnotationsTransform.dedupAnnotations(state.annotations.toSeq, InstanceKeyGraph(state.circuit)),
     state.renames
   )
 }