Disable enum unboxing for proto enums

Bug: 170798502
Fixes: 170793438
Change-Id: I57e28fd0537a6174e3196f3b1fee2917ffb7d9c4
diff --git a/src/main/java/com/android/tools/r8/utils/InternalOptions.java b/src/main/java/com/android/tools/r8/utils/InternalOptions.java
index 8bc1a55..52ed8b2 100644
--- a/src/main/java/com/android/tools/r8/utils/InternalOptions.java
+++ b/src/main/java/com/android/tools/r8/utils/InternalOptions.java
@@ -180,7 +180,8 @@
     protoShrinking.enableGeneratedMessageLiteShrinking = true;
     protoShrinking.enableGeneratedMessageLiteBuilderShrinking = true;
     protoShrinking.enableGeneratedExtensionRegistryShrinking = true;
-    protoShrinking.enableEnumLiteProtoShrinking = true;
+    // TODO(b/170798502): Reland enum unboxing for proto enums.
+    // protoShrinking.enableEnumLiteProtoShrinking = true;
   }
 
   void disableAllOptimizations() {