Clean-up in r8 nest based access constructor call

Bug: 130529390
Change-Id: Ice374a82703891edb43d9e582fd87f5619f8396a
diff --git a/src/main/java/com/android/tools/r8/ir/desugar/NestedPrivateMethodLense.java b/src/main/java/com/android/tools/r8/ir/desugar/NestedPrivateMethodLense.java
index 252bf7c..a324d61b 100644
--- a/src/main/java/com/android/tools/r8/ir/desugar/NestedPrivateMethodLense.java
+++ b/src/main/java/com/android/tools/r8/ir/desugar/NestedPrivateMethodLense.java
@@ -129,16 +129,18 @@
 
   @Override
   public RewrittenPrototypeDescription lookupPrototypeChanges(DexMethod method) {
-    RewrittenPrototypeDescription previous = previousLense.lookupPrototypeChanges(method);
     DexType[] parameters = method.proto.parameters.values;
     if (parameters.length == 0) {
-      return previous;
+      return previousLense.lookupPrototypeChanges(method);
     }
     DexType lastParameterType = parameters[parameters.length - 1];
     if (lastParameterType == nestConstructorType) {
-      return previous.withExtraNullParameter();
+      // This is an access bridge for a constructor that has been synthesized during
+      // nest-based access desugaring.
+      assert previousLense.lookupPrototypeChanges(method).isEmpty();
+      return RewrittenPrototypeDescription.none().withExtraNullParameter();
     }
-    return previous;
+    return previousLense.lookupPrototypeChanges(method);
   }
 
   @Override