Use CHECK-LABEL in one of the tests to simplify on-bot debugging

git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1951 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5
Remove CHECK-LABEL's on lines with variables. Oops.

git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1952 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5