message: Add missing include (with new version of LLVM).
diff: @@ -27,6 +27,7 @@ limitations under the License.
  #include "llvm/IR/GlobalVariable.h"
  #include "llvm/IR/MDBuilder.h"
  #include "llvm/IR/Operator.h"
  +#include "llvm/Support/CommandLine.h"
  #include "llvm/Target/TargetOptions.h"
  #include "llvm/Transforms/Utils/Cloning.h"
  #include "tensorflow/compiler/xla/layout_util.h"
  