Fix this test and don't run it in ASan bootstrap

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@200291 91177308-0d34-0410-b5e6-96231b3b80d8
Clarify. Thanks to Sean Silva and Warren Hunt for help wordsmithing!


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@200292 91177308-0d34-0410-b5e6-96231b3b80d8