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merge revision(s) 58077: [Backport #13358]

    ostruct.rb: fix OpenStruct.allocate

    * lib/ostruct.rb (OpenStruct.allocate): initialize an instance
      variable directly, without calling `intialize` method which may
      be overridden in a subclass.  [ruby-core:80292] [Bug #13358]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@58161 b2dd03c8-39d4-4d8f-98ff-823fe69b080e