* marshal.c (r_symreal): register symbol names as strings first so
that r_symlink always returns valid names.
[ruby-core:68587] [Bug #10991]
* marshal.c (r_ivar, r_object0): now need to intern symbol names.
* marshal.c (r_object0): compare with symbol names.
merge revision(s) 50057,50065: [Backport #10991]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@50632 b2dd03c8-39d4-4d8f-98ff-823fe69b080e