Yi Wu 9a27ac5d89 Fix drop column family data race
Summary:
A data race is caught by tsan_crash test between compaction and DropColumnFamily:
https://gist.github.com/yiwu-arbug/5a2b4baae05eeb99ae1719b650f30a44 Compaction checks if the column family has been dropped on each key input, while user can issue DropColumnFamily which updates cfd->dropped_, causing the data race. Fixing it by making cfd->dropped_ an atomic.
Closes https://github.com/facebook/rocksdb/pull/3250

Differential Revision: D6535991

Pulled By: yiwu-arbug

fbshipit-source-id: 5571df020beae7fa7db6fff5ad0d598f49962895
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