cannot get right max table id when to init stats

[hawkingrei]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

when we get max table id, we should save it into atomic value. but we save common table id into it. so it is bad max table id and lead to other problem .

2. What did you expect to see? (Required)

3. What did you see instead (Required)

4. What is your TiDB version? (Required)

master