message: Support setting values for int8
  Summary: Fixes T34182
  Reviewers: #tensorflow, simonl, #framework_ip_review_-_any_oss_or_third-party_code_use_has_been_approved, hakons
  Maniphest Tasks: T34182
diff: @@ -1033,6 +1033,12 @@ Status SetInitialTensorValue(poplar::Graph& graph, poplar::Tensor& tensor,
  case PRED:
  SetInitialTensorValueImpl<bool>(graph, tensor, literal);
  break;
  + case S8:
  + SetInitialTensorValueImpl<char>(graph, tensor, literal);
  + break;
  + case U8:
  + SetInitialTensorValueImpl<unsigned char>(graph, tensor, literal);
  + break;
  case S32:
  SetInitialTensorValueImpl<int>(graph, tensor, literal);
  break;
  @@ -1137,6 +1143,12 @@ StatusOr<poplar::Tensor> CreateConstantTensor(
  case PRED:
  return CreateConstantTensorImpl<bool>(graph, literal, shape, poplar_type,
  debug_name_and_id);
  + case S8:
  + return CreateConstantTensorImpl<char>(graph, literal, shape, poplar_type,
  + debug_name_and_id);
  + case U8:
  + return CreateConstantTensorImpl<unsigned char>(
  + graph, literal, shape, poplar_type, debug_name_and_id);
  case S32:
  return CreateConstantTensorImpl<int>(graph, literal, shape, poplar_type,
  debug_name_and_id);
  