[ruby-cvs:66198] ko1:r59024 (trunk): revert r59023 because it contans unrelated developping code

[ko1 at ruby-lang.org]

ko1	2017-06-06 16:10:19 +0900 (Tue, 06 Jun 2017)

  New Revision: 59024

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=59024

  Log:
    revert r59023 because it contans unrelated developping code

  Modified files:
    trunk/test/ruby/test_io.rb
    trunk/thread.c
    trunk/vm.c
    trunk/vm_core.h