[snapshot] support including templates in the snapshot.

src/snapshot/partial-serializer.cc

Index: src/snapshot/partial-serializer.cc
diff --git a/src/snapshot/partial-serializer.cc b/src/snapshot/partial-serializer.cc
index eec49c060e325e06ac9c915ea4fcbb155604924b..d1d33538ba5e28a50f20fad92485b27cfa50137a 100644
--- a/src/snapshot/partial-serializer.cc
+++ b/src/snapshot/partial-serializer.cc
@@ -74,6 +74,8 @@ void PartialSerializer::SerializeObject(HeapObject* obj, HowToCode how_to_code,
   // All the internalized strings that the partial snapshot needs should be
   // either in the root table or in the partial snapshot cache.
   DCHECK(!obj->IsInternalizedString());
+  // Function and object templates are not context specific.
+  DCHECK(!obj->IsTemplateInfo());
 
   if (SerializeKnownObject(obj, how_to_code, where_to_point, skip)) return;