Print slave name in buildbot_selector

git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1725 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5
Add sanitizer-x86_64-linux builder from lab.llvm.org

git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1726 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5
Add the option to exclude 32-bit tests

git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1727 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5