PPC/s390: [wasm] adding case for kAttachedReference in Serializer/Deseriealizer

src/snapshot/serializer.cc

Index: src/snapshot/serializer.cc
diff --git a/src/snapshot/serializer.cc b/src/snapshot/serializer.cc
index 9abf427237458d4e83368b9a1e2ed3935b53e4a3..d7a7f8927851dbd2d1bcb80a231c583ce0615099 100644
--- a/src/snapshot/serializer.cc
+++ b/src/snapshot/serializer.cc
@@ -248,6 +248,7 @@ void Serializer::PutAttachedReference(SerializerReference reference,
   DCHECK(reference.is_attached_reference());
   DCHECK((how_to_code == kPlain && where_to_point == kStartOfObject) ||
          (how_to_code == kPlain && where_to_point == kInnerPointer) ||
+         (how_to_code == kFromCode && where_to_point == kStartOfObject) ||
          (how_to_code == kFromCode && where_to_point == kInnerPointer));
   sink_.Put(kAttachedReference + how_to_code + where_to_point, "AttachedRef");
   sink_.PutInt(reference.attached_reference_index(), "AttachedRefIndex");