vm_eval.c: follow the original class
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56520 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
vm_eval.c: follow the original class
loop the prepended module. [ruby-core:77784] [Bug #12876]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56520 b2dd03c8-39d4-4d8f-98ff-823fe69b080e