message: Correct cut-and-paste error where the wrong instruction is analysed for the constant
diff: @@ -247,7 +247,7 @@ CreateSimpleReduction(poplar::Graph &graph,
  op, seq, inst->name());
  // Apply initial value
  - Literal identity_literal = GetIdentityConstantTensor(inst);
  + Literal identity_literal = GetIdentityConstantTensor(root);
  auto* init_inst = inst->operand(1);
  if (!(init_inst->IsConstant() &&
  init_inst->literal() == identity_literal)) {
  @@ -356,7 +356,7 @@ CreateSimpleWindowReduction(poplar::Graph &graph,
  seq.add(poplar::program::Execute(cs));
  // Apply initial value
  - Literal identity_literal = GetIdentityConstantTensor(inst);
  + Literal identity_literal = GetIdentityConstantTensor(root);
  auto* init_inst = inst->operand(1);
  if (!(init_inst->IsConstant() &&
  init_inst->literal() == identity_literal)) {
  