Patched by Masaki Matsushita. [Bug #5355] [ruby-dev:44521]

* test/thread/test_sync.rb (test_sync_lock_and_wakeup,
  test_sync_upgrade_and_wakeup, test_sync_lock_and_raise):
  new test.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36936 b2dd03c8-39d4-4d8f-98ff-823fe69b080e