Include the canonical static closure when serializing ClosureData.

runtime/vm/raw_object_snapshot.cc

Index: runtime/vm/raw_object_snapshot.cc
diff --git a/runtime/vm/raw_object_snapshot.cc b/runtime/vm/raw_object_snapshot.cc
index ed22fa28780d1d15c9c664096d6d47e28bfb65eb..d02909c40cd87194a6527e2618c9295b151e3267 100644
--- a/runtime/vm/raw_object_snapshot.cc
+++ b/runtime/vm/raw_object_snapshot.cc
@@ -732,9 +732,8 @@ void RawClosureData::WriteTo(SnapshotWriter* writer,
   // Signature type.
   writer->WriteObjectImpl(ptr()->signature_type_, kAsInlinedObject);
 
-  // Static closure/Closure allocation stub.
-  // We don't write the closure or allocation stub in the snapshot.
-  writer->WriteVMIsolateObject(kNullObject);
+  // Canonical static closure.
+  writer->WriteObjectImpl(ptr()->closure_, kAsInlinedObject);
 }