message: Fix flaky position_test
diff: @@ -30,7 +30,7 @@ namespace {
  TEST(BoardVisitorTest, TestEpochRollover) {
  for (int j = 0; j <= 256; ++j) {
  BoardVisitor bv;
  - for (int i = 0; i < j; ++i) {
  + for (int i = 0; i <= j; ++i) {
  bv.Begin();
  }
  for (int i = 0; i < kN * kN; ++i) {
  @@ -45,7 +45,7 @@ TEST(BoardVisitorTest, TestEpochRollover) {
  TEST(GroupVisitorTest, TestEpochRollover) {
  for (int j = 0; j <= 256; ++j) {
  GroupVisitor gv;
  - for (int i = 0; i < j; ++i) {
  + for (int i = 0; i <= j; ++i) {
  gv.Begin();
  }
  for (int i = 0; i < Group::kMaxNumGroups; ++i) {
  