merge revision(s) 54256: [Backport #12118]
* thread_pthread.c (reserve_stack): fix reserving position where the stack growing bottom to top. [Bug #12118]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@54430 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 54256: [Backport #12118]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@54430 b2dd03c8-39d4-4d8f-98ff-823fe69b080e