merge revision(s) 54000: [Backport #12148]
* thread_pthread.c (getstack): __pi_stacksize returned by pthread_getthrds_np() is wrong on AIX. Use __pi_stackend - __pi_stackaddr instead.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@54371 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 54000: [Backport #12148]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@54371 b2dd03c8-39d4-4d8f-98ff-823fe69b080e