Kill -faddress-sanitizer, -fthread-sanitizer and -fcatch-undefined-behavior flags.

These flags are deprecated since at least Clang 3.3. Users should instead
use -fsanitize= with appropriate values.


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@204330 91177308-0d34-0410-b5e6-96231b3b80d8