DorianZheng 0f88160f67 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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