merge revision(s) r46151,r46165: [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.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@47140 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) r46151,r46165: [Backport #9865]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@47140 b2dd03c8-39d4-4d8f-98ff-823fe69b080e