Set the UAR flag for the upcoming test

git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1855 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5
Turn a thread-stack-UAR test (see issue 216) into a simple stack-UAR test

git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1856 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5