VM: Save one bool when serializing library prefixes.

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 1171 matching lines @@
   // Allocate library prefix object.
   LibraryPrefix& prefix = LibraryPrefix::ZoneHandle(reader->zone(),
                                                     LibraryPrefix::New());
   reader->AddBackRef(object_id, &prefix, kIsDeserialized);
 
   // Set all non object fields.
   prefix.StoreNonPointer(&prefix.raw_ptr()->num_imports_,
                          reader->Read<int16_t>());
   prefix.StoreNonPointer(&prefix.raw_ptr()->is_deferred_load_,
                          reader->Read<bool>());
-  prefix.StoreNonPointer(&prefix.raw_ptr()->is_loaded_, reader->Read<bool>());
+  prefix.StoreNonPointer(&prefix.raw_ptr()->is_loaded_, false);
 
   // Set all the object fields.
   READ_OBJECT_FIELDS(prefix,
                      prefix.raw()->from(),
                      prefix.raw()->to_snapshot(kind),
                      kAsReference);
   prefix.StorePointer(&prefix.raw_ptr()->dependent_code_,
                       Array::null());
 
   return prefix.raw();
@@ skipping 10 matching lines @@
   // Write out the serialization header value for this object.
   writer->WriteInlinedObjectHeader(object_id);
 
   // Write out the class and tags information.
   writer->WriteIndexedObject(kLibraryPrefixCid);
   writer->WriteTags(writer->GetObjectTags(this));
 
   // Write out all non object fields.
   writer->Write<int16_t>(ptr()->num_imports_);
   writer->Write<bool>(ptr()->is_deferred_load_);
-  writer->Write<bool>(ptr()->is_loaded_);
 
   // Write out all the object pointer fields.
   SnapshotWriterVisitor visitor(writer, kAsReference);
   visitor.VisitPointers(from(), to_snapshot(kind));
 }
 
 
 RawNamespace* Namespace::ReadFrom(SnapshotReader* reader,
                                   intptr_t object_id,
                                   intptr_t tags,
@@ skipping 1837 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