Implement capability to use the same library prefix for multiple library imports (currently this ...

vm/raw_object_snapshot.cc

Index: vm/raw_object_snapshot.cc
===================================================================
--- vm/raw_object_snapshot.cc	(revision 4282)
+++ vm/raw_object_snapshot.cc	(working copy)
@@ -771,6 +771,9 @@
   // Set the object tags.
   prefix.set_tags(tags);
 
+  // Set all non object fields.
+  prefix.raw_ptr()->num_libs_ = reader->ReadIntptrValue();
+
   // Set all the object fields.
   // TODO(5411462): Need to assert No GC can happen here, even though
   // allocations may happen.
@@ -795,6 +798,9 @@
   // Write out the class and tags information.
   writer->WriteObjectHeader(Object::kLibraryPrefixClass, ptr()->tags_);
 
+  // Write out all non object fields.
+  writer->WriteIntptrValue(ptr()->num_libs_);
+
   // Write out all the object pointer fields.
   SnapshotWriterVisitor visitor(writer);
   visitor.VisitPointers(from(), to());