message: Check per HLO instruction only at vlog=1 in non-opt build.
diff: @@ -566,7 +566,9 @@ Status MemoryUsageTracker::BeginInstruction(Item* item) {
  VLOG(3) << " memory usage = " << memory_usage_;
  VLOG(10) << ToString();
  + if (VLOG_IS_ON(1)) {
  DCHECK(Check());
  + }
  return Status::OK();
  }
  @@ -603,8 +605,9 @@ Status MemoryUsageTracker::EndInstruction() {
  VLOG(3) << " memory usage = " << memory_usage_;
  VLOG(10) << ToString();
  + if (VLOG_IS_ON(1)) {
  DCHECK(Check());
  -
  + }
  return Status::OK();
  }
  