merge revision(s) r49182,r49183: [Backport #10706]
vm_method.c: fix change refined new method visibility * vm_method.c (rb_export_method): bail out if the original method is undefined when the method is refined. [ruby-core:67387] [Bug #10706]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@49786 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) r49182,r49183: [Backport #10706]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@49786 b2dd03c8-39d4-4d8f-98ff-823fe69b080e