enum.c: respect method visibility
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58871 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
enum.c: respect method visibility
optimize uncallable method. [ruby-core:81349] [Bug #13592]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58871 b2dd03c8-39d4-4d8f-98ff-823fe69b080e