Fix a typo

git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1969 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5
Add a repro for issue 252 - DRASan fails to identify a thread

git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1970 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5