Fix `CompactFiles` bug (#4665)
Summary: `CompactFiles` gets `SuperVersion` before `WaitForIngestFile`, while `IngestExternalFile` may add files that overlap with `input_file_names` The timeline of execution flow is as follow: Let's say that level N has two file [1,2] and [5,6] ``` timeline user_thread1 user_thread2 t0 | CompactFiles([1, 2], [5, 6]) begin t1 | GetReferencedSuperVersion() t2 | IngestExternalFile([3,4]) to level N begin t3 | CompactFiles resume V ``` Pull Request resolved: https://github.com/facebook/rocksdb/pull/4665 Differential Revision: D13030674 Pulled By: ajkr fbshipit-source-id: 8be19477fd6e505032267a979d32f3097cc3be51
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