test_open3.rb: let test_popen2 work with --jit
test/lib/jit_support.rb: add .remove_mjit_logs to normalize stderr
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63289 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_open3.rb: let test_popen2 work with --jit
test/lib/jit_support.rb: add .remove_mjit_logs to normalize stderr
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63289 b2dd03c8-39d4-4d8f-98ff-823fe69b080e