Hash's compare_by_identity state does not marshal #9063

$ cx ruby-master ruby -e 's = Hash.new; p Marshal.dump(s)' 
"\x04\b{\x00"
$ cx ruby-master ruby -e 's = Hash.new; s.compare_by_identity; p Marshal.dump(s)'
"\x04\bC:\tHash{\x00"
$ jruby -e 's = Hash.new; p Marshal.dump(s)'              
"\x04\b{\x00"
$ jruby -e 's = Hash.new; s.compare_by_identity; p Marshal.dump(s)'              
"\x04\b{\x00"