[kernel] Make snapshotting work.

runtime/vm/clustered_snapshot.cc

Index: runtime/vm/clustered_snapshot.cc
diff --git a/runtime/vm/clustered_snapshot.cc b/runtime/vm/clustered_snapshot.cc
index 43264a159b270200266794d9f00a1b6fda49e274..6bd8ba914e16f3df87ab21600a3a5a39c219f1c7 100644
--- a/runtime/vm/clustered_snapshot.cc
+++ b/runtime/vm/clustered_snapshot.cc
@@ -551,6 +551,7 @@ class FunctionSerializationCluster : public SerializationCluster {
       if (kind != Snapshot::kFullAOT) {
         s->WriteTokenPosition(func->ptr()->token_pos_);
         s->WriteTokenPosition(func->ptr()->end_token_pos_);
+        s->Write<int32_t>(func->ptr()->kernel_offset_);
       }
 #endif
       s->Write<int16_t>(func->ptr()->num_fixed_parameters_);
@@ -625,6 +626,7 @@ class FunctionDeserializationCluster : public DeserializationCluster {
       if (kind != Snapshot::kFullAOT) {
         func->ptr()->token_pos_ = d->ReadTokenPosition();
         func->ptr()->end_token_pos_ = d->ReadTokenPosition();
+        func->ptr()->kernel_offset_ = d->Read<int32_t>();
       }
 #endif
       func->ptr()->num_fixed_parameters_ = d->Read<int16_t>();
@@ -1023,6 +1025,9 @@ class FieldSerializationCluster : public SerializationCluster {
         s->WriteTokenPosition(field->ptr()->token_pos_);
         s->WriteCid(field->ptr()->guarded_cid_);
         s->WriteCid(field->ptr()->is_nullable_);
+#if !defined(DART_PRECOMPILED_RUNTIME)
+        s->Write<int32_t>(field->ptr()->kernel_offset_);
+#endif
       }
       s->Write<uint8_t>(field->ptr()->kind_bits_);
     }
@@ -1070,6 +1075,9 @@ class FieldDeserializationCluster : public DeserializationCluster {
         field->ptr()->token_pos_ = d->ReadTokenPosition();
         field->ptr()->guarded_cid_ = d->ReadCid();
         field->ptr()->is_nullable_ = d->ReadCid();
+#if !defined(DART_PRECOMPILED_RUNTIME)
+        field->ptr()->kernel_offset_ = d->Read<int32_t>();
+#endif
       }
       field->ptr()->kind_bits_ = d->Read<uint8_t>();
     }
@@ -1293,6 +1301,7 @@ class ScriptSerializationCluster : public SerializationCluster {
       s->Write<int32_t>(script->ptr()->line_offset_);
       s->Write<int32_t>(script->ptr()->col_offset_);
       s->Write<int8_t>(script->ptr()->kind_);
+      s->Write<int32_t>(script->ptr()->kernel_script_index_);
     }
   }
 
@@ -1337,6 +1346,7 @@ class ScriptDeserializationCluster : public DeserializationCluster {
       script->ptr()->line_offset_ = d->Read<int32_t>();
       script->ptr()->col_offset_ = d->Read<int32_t>();
       script->ptr()->kind_ = d->Read<int8_t>();
+      script->ptr()->kernel_script_index_ = d->Read<int32_t>();
       script->ptr()->load_timestamp_ = 0;
     }
   }