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merge revision(s) 56469: [Backport #12860]

    * compile.c (setup_args): duplicate splatting array if more
      arguments present to obey left-to-right execution order.
      [ruby-core:77701] [Bug# 12860]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@57210 b2dd03c8-39d4-4d8f-98ff-823fe69b080e