[VM generic function reification] Support generic functions in Invocation class.

runtime/vm/snapshot.cc

Index: runtime/vm/snapshot.cc
diff --git a/runtime/vm/snapshot.cc b/runtime/vm/snapshot.cc
index 9bc8103c6d8f9d8a51107e4415b32b95a6838a0d..5ceb31ddaccbbdf4966c92ae3dc4c28240c57142 100644
--- a/runtime/vm/snapshot.cc
+++ b/runtime/vm/snapshot.cc
@@ -34,6 +34,7 @@ static const int kNumInitialReferences = 32;
 static bool IsSingletonClassId(intptr_t class_id) {
   // Check if this is a singleton object class which is shared by all isolates.
   return ((class_id >= kClassCid && class_id <= kUnwindErrorCid) ||
+          (class_id == kTypeArgumentsCid) ||
           (class_id >= kNullCid && class_id <= kVoidCid));
 }