symbols should be in the startup snapshot

src/serialize.h

Index: src/serialize.h
diff --git a/src/serialize.h b/src/serialize.h
index e5664ff39c35c101b47e3d15b9c7c9a54f28398a..a6099afc23f397fdcfedea0781cca8c7767c5ec2 100644
--- a/src/serialize.h
+++ b/src/serialize.h
@@ -613,7 +613,7 @@ class PartialSerializer : public Serializer {
     // unique ID, and deserializing several partial snapshots containing script
     // would cause dupes.
     ASSERT(!o->IsScript());
-    return o->IsString() || o->IsSharedFunctionInfo() ||
+    return o->IsName() || o->IsSharedFunctionInfo() ||
            o->IsHeapNumber() || o->IsCode() ||
            o->IsScopeInfo() ||
            o->map() == HEAP->fixed_cow_array_map();