message: Add missing #include.
diff: @@ -27,6 +27,7 @@ limitations under the License.
  #include "llvm/IR/IRBuilder.h"
  #include "llvm/IR/Module.h"
  #include "llvm/IR/Value.h"
  +#include "llvm/Target/TargetMachine.h"
  #include "tensorflow/compiler/xla/service/buffer_assignment.h"
  #include "tensorflow/compiler/xla/service/dfs_hlo_visitor_with_default.h"
  #include "tensorflow/compiler/xla/service/hlo_computation.h"
  