Support const modifier in fields, variables

runtime/vm/raw_object_snapshot.cc

Index: runtime/vm/raw_object_snapshot.cc
===================================================================
--- runtime/vm/raw_object_snapshot.cc	(revision 9982)
+++ runtime/vm/raw_object_snapshot.cc	(working copy)
@@ -498,6 +498,7 @@
   field.set_token_pos(reader->ReadIntptrValue());
   field.set_is_static(reader->Read<bool>());
   field.set_is_final(reader->Read<bool>());
+  field.set_is_const(reader->Read<bool>());
   field.set_has_initializer(reader->Read<bool>());
 
   // Set all the object fields.
@@ -529,6 +530,7 @@
   writer->WriteIntptrValue(ptr()->token_pos_);
   writer->Write<bool>(ptr()->is_static_);
   writer->Write<bool>(ptr()->is_final_);
+  writer->Write<bool>(ptr()->is_const_);
   writer->Write<bool>(ptr()->has_initializer_);
 
   // Write out all the object pointer fields.