vm_method.c: use the current visibility
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51015 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
vm_method.c: use the current visibility
instead of tests for each visibilities.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51015 b2dd03c8-39d4-4d8f-98ff-823fe69b080e