Add a CHECK to make sure we don't accidentally serialize type feedback

src/serialize.h

Index: src/serialize.h
diff --git a/src/serialize.h b/src/serialize.h
index bd0c423a6aa8281838806e682afdabd7723b641e..aa9fc8073e7776498c23f2603c92783b2a53c14e 100644
--- a/src/serialize.h
+++ b/src/serialize.h
@@ -593,7 +593,8 @@ class CodeAddressMap;
 // There can be only one serializer per V8 process.
 class Serializer : public SerializerDeserializer {
  public:
-  Serializer(Isolate* isolate, SnapshotByteSink* sink);
+  Serializer(Isolate* isolate, SnapshotByteSink* sink,
+             bool allow_type_feedback);
   ~Serializer();
   void VisitPointers(Object** start, Object** end) OVERRIDE;
 
@@ -725,6 +726,7 @@ class Serializer : public SerializerDeserializer {
   // We map serialized large objects to indexes for back-referencing.
   uint32_t large_objects_total_size_;
   uint32_t seen_large_objects_index_;
+  bool allow_type_feedback_;
 
   DISALLOW_COPY_AND_ASSIGN(Serializer);
 };
@@ -732,11 +734,10 @@ class Serializer : public SerializerDeserializer {
 
 class PartialSerializer : public Serializer {
  public:
-  PartialSerializer(Isolate* isolate,
-                    Serializer* startup_snapshot_serializer,
+  PartialSerializer(Isolate* isolate, Serializer* startup_snapshot_serializer,
                     SnapshotByteSink* sink)
-    : Serializer(isolate, sink),
-      startup_serializer_(startup_snapshot_serializer) {
+      : Serializer(isolate, sink, true),
+        startup_serializer_(startup_snapshot_serializer) {
     InitializeCodeAddressMap();
   }
 
@@ -769,7 +770,7 @@ class PartialSerializer : public Serializer {
 class StartupSerializer : public Serializer {
  public:
   StartupSerializer(Isolate* isolate, SnapshotByteSink* sink)
-      : Serializer(isolate, sink), root_index_wave_front_(0) {
+      : Serializer(isolate, sink, true), root_index_wave_front_(0) {
     // Clear the cache of objects used by the partial snapshot.  After the
     // strong roots have been serialized we can create a partial snapshot
     // which will repopulate the cache with objects needed by that partial
@@ -827,7 +828,7 @@ class CodeSerializer : public Serializer {
  private:
   CodeSerializer(Isolate* isolate, SnapshotByteSink* sink, String* source,
                  Code* main_code)
-      : Serializer(isolate, sink),
+      : Serializer(isolate, sink, false),
         source_(source),
         main_code_(main_code),
         num_internalized_strings_(0) {