message: Fix compiler error when updating to latest Poplar API
diff: @@ -134,15 +134,15 @@ LookupBinaryInPlaceFn(const HloInstruction* inst) {
  static poplin::FullyConnectedPass GetMatMulPass(const HloInstruction* inst) {
  if (IsForwardMatMul(inst)) {
  - return poplin::FullyConnectedPass::FWD;
  + return poplin::FullyConnectedPass::TRAINING_FWD;
  }
  if (IsGradientMatMul(inst)) {
  - return poplin::FullyConnectedPass::BWD;
  + return poplin::FullyConnectedPass::TRAINING_BWD;
  }
  if (IsWeightUpdateMatMul(inst)) {
  - return poplin::FullyConnectedPass::WU;
  + return poplin::FullyConnectedPass::TRAINING_WU;
  }
  - return poplin::FullyConnectedPass::NONE;
  + return poplin::FullyConnectedPass::INFERENCE_FWD;
  }
  port::StatusOr<poplar::program::Program>
  