message: Add op metadata to bitcasts inserted by ReductionLayoutNormalizer.
diff: @@ -101,6 +101,7 @@ class EnforceMinorToMajorReduceOpVisitor : public DfsHloRewriteVisitor {
  new_reduce_shape_layout);
  HloInstruction *canonical_reduce_input = reduce->parent()->AddInstruction(
  HloInstruction::CreateBitcast(new_operand_shape, operand));
  + canonical_reduce_input->set_metadata(reduce->metadata());
  VLOG(5) << "Reduction input: " << canonical_reduce_input->ToString();
  std::unique_ptr<HloInstruction> new_reduce = HloInstruction::CreateReduce(
  