Allow the resolved names cache to be lazily created like the exported names cache.

runtime/vm/raw_object_snapshot.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/native_entry.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/snapshot.h"
 #include "vm/stub_code.h"
 #include "vm/symbols.h"
@@ skipping 1137 matching lines @@
 
     // Set all the object fields.
     // TODO(5411462): Need to assert No GC can happen here, even though
     // allocations may happen.
     intptr_t num_flds = (library.raw()->to_snapshot() - library.raw()->from());
     for (intptr_t i = 0; i <= num_flds; i++) {
       (*reader->PassiveObjectHandle()) = reader->ReadObjectImpl(kAsReference);
       library.StorePointer((library.raw()->from() + i),
                            reader->PassiveObjectHandle()->raw());
     }
-    // Initialize cache of resolved names.
-    const intptr_t kInitialNameCacheSize = 64;
-    // The cache of resolved names in library scope is not serialized.
-    library.InitResolvedNamesCache(kInitialNameCacheSize);
+    // Initialize caches that are not serialized.
+    library.StorePointer(&library.raw_ptr()->resolved_names_, Array::null());
+    library.StorePointer(&library.raw_ptr()->exported_names_, Array::null());
+    library.StorePointer(&library.raw_ptr()->loaded_scripts_, Array::null());
     library.Register(reader->thread());
-    library.StorePointer(&library.raw_ptr()->exported_names_, Array::null());
-    // Initialize cache of loaded scripts.
-    library.StorePointer(&library.raw_ptr()->loaded_scripts_, Array::null());
   }
   return library.raw();
 }
 
 
 void RawLibrary::WriteTo(SnapshotWriter* writer,
                          intptr_t object_id,
                          Snapshot::Kind kind,
                          bool as_reference) {
   ASSERT(writer != NULL);
@@ skipping 1892 matching lines @@
     // We do not allow objects with native fields in an isolate message.
     writer->SetWriteException(Exceptions::kArgument,
                               "Illegal argument in isolate message"
                               " : (object is a UserTag)");
   } else {
     UNREACHABLE();
   }
 }
 
 }  // namespace dart