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.

llvm-svn: 204330

clang/lib/CodeGen/CodeGenFunction.cpp

@@ -1365,7 +1365,7 @@ CodeGenFunction::getVLASize(const VariableArrayType *type) {
       numElements = vlaSize;
     } else {
       // It's undefined behavior if this wraps around, so mark it that way.
-      // FIXME: Teach -fcatch-undefined-behavior to trap this.
+      // FIXME: Teach -fsanitize=undefined to trap this.
       numElements = Builder.CreateNUWMul(numElements, vlaSize);
     }
   } while ((type = getContext().getAsVariableArrayType(elementType)));