[tsan] add a printf to a test

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@212951 91177308-0d34-0410-b5e6-96231b3b80d8
[tsan] honour XFAIL in tsan/test_output.sh

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@212952 91177308-0d34-0410-b5e6-96231b3b80d8