merge revision(s) 55602: [Backport #12560]
require "rbconfig/sizeof" They may fail parallel test-all
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@55635 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 55602: [Backport #12560]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@55635 b2dd03c8-39d4-4d8f-98ff-823fe69b080e