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vm_args.c: to_proc refinements

• vm_args.c (vm_to_proc): enable #to_proc by refinements at Proc
  passing as a block. patched by osyo (manga osyo).
  [Feature #14223]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62020 b2dd03c8-39d4-4d8f-98ff-823fe69b080e