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vm_eval.c: next super class from the original

• vm_eval.c (vm_call_super): search next super class from the
  original class, to get rid of infinite recursion with
  prepending. a patch by Seiei Higa at
  [ruby-core:68434]. [ruby-core:68093] [Bug #10847]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49867 b2dd03c8-39d4-4d8f-98ff-823fe69b080e