Add reference to issue regarding pinning of desugared items.

Bug: 157700141

Change-Id: I6b38e59ed543c9d55e25b88b23a232d5da27a3d6
diff --git a/src/main/java/com/android/tools/r8/shaking/Enqueuer.java b/src/main/java/com/android/tools/r8/shaking/Enqueuer.java
index 5dc5405..ffb45b6 100644
--- a/src/main/java/com/android/tools/r8/shaking/Enqueuer.java
+++ b/src/main/java/com/android/tools/r8/shaking/Enqueuer.java
@@ -3331,6 +3331,7 @@
     action.getAction().accept(builder);
   }
 
+  // TODO(b/157700141): Determine if this is the right way to avoid modification of pinned lambdas.
   private void unpinLambdaMethods() {
     assert desugaredLambdaImplementationMethods.isEmpty()
         || options.desugarState == DesugarState.ON;
diff --git a/src/main/java/com/android/tools/r8/shaking/KeepInfoCollection.java b/src/main/java/com/android/tools/r8/shaking/KeepInfoCollection.java
index 97a7fb2..37c8771 100644
--- a/src/main/java/com/android/tools/r8/shaking/KeepInfoCollection.java
+++ b/src/main/java/com/android/tools/r8/shaking/KeepInfoCollection.java
@@ -280,7 +280,7 @@
       unsafeUnpinMethod(method.getReference());
     }
 
-    // TODO(b/156715504): Avoid pinning/unpinning references.
+    // TODO(b/157700141): Avoid pinning/unpinning references.
     @Deprecated
     public void unsafeUnpinMethod(DexMethod method) {
       KeepMethodInfo info = keepMethodInfo.get(method);