message: Have the HloEvaluator print out intermediate values on VLOG(100)
  This is useful for tracing through very small HLO programs.
diff: @@ -274,6 +274,13 @@ StatusOr<Literal> HloEvaluator::Evaluate(
  engine_.seed(seed_);
  TF_RETURN_IF_ERROR(computation.Accept(this));
  +
  + if (VLOG_IS_ON(100)) {
  + for (const HloInstruction* instr : computation.instructions()) {
  + VLOG(100) << instr->name() << " = " << GetEvaluatedLiteralFor(instr);
  + }
  + }
  +
  return GetEvaluatedLiteralFor(computation.root_instruction()).Clone();
  }
  