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merge revision(s) 60384: [Backport #13887]

    thread_pthread: do not corrupt stack

    This fixes stuck test/ruby/test_io.rb with FIBER_USE_NATIVE=0 on
    GNU/Linux because linked-list pointers used by glibc get
    corrupted when fiber stacks are copied.

    Thanks to wanabe for finding the bug and original patch.

    * thread_pthread (native_thread_init_stack): fix stack corruption
      [ruby-core:82737] [Bug #13387]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@62825 b2dd03c8-39d4-4d8f-98ff-823fe69b080e