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Revision 47368

merge revision(s) 46151,46165: [Backport #9865]

* io.c (rb_io_fileno, rb_io_inspect): non-modification does not
  error on frozen IO.  [ruby-dev:48241] [Bug #9865]

* io.c (rb_io_autoclose_p): Don't raise on frozen IO.

* test/lib/minitest/unit.rb: IO#autoclose? may raise IOError.