MemTableList::Add: MarkImmutable() before current_->Add()
#13682
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The semantic of MemTableList::Add is add the immutable memtable, so current_->Add() should be called after MarkImmutable().
MemTable.MarkImmutable() calls MemTableRep.MarkReadOnly(), which may update memory usage which reported by ApproximateMemoryUsage, thus causing assert fail in MemTableListVersion::UnrefMemTable().
This issue was not reproduced is because rocksdb builtin MemTableRep does not update ApproximateMemoryUsage in MarkImmutable, but our custom MemTableRep does, yield the fails.