message: fix loading break due to undefined symbol
diff: @@ -25,6 +25,11 @@ limitations under the License.
  namespace tensorflow {
  +/*static*/ constexpr const char* const
  + LowerFunctionalOpsPass::kLowerUsingSwitchMergeAttr;
  +/*static*/ constexpr const char* const
  + LowerFunctionalOpsPass::kLowerAsMultiDeviceFunctionAttr;
  +
  namespace {
  constexpr const char* const kLowerUsingSwitchMergeAttr =
  