Yi Wu a68d814570 fast look up purge_queue (#5796)
Summary:
purge_queue_ maybe contains thousands sst files, for example manual compact a range. If full scan is triggered at the same time and the total sst files number is large, RocksDB will be blocked at https://github.com/facebook/rocksdb/blob/master/db/db_impl_files.cc#L150 for several seconds. In our environment we have 140,000 sst files and the manual compaction delete about 1000 sst files, it blocked about 2 minutes.

Commandeering https://github.com/facebook/rocksdb/issues/5290.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5796

Differential Revision: D17357775

Pulled By: riversand963

fbshipit-source-id: 20eacca917355b8de975ccc7b1c9a3e7bd5b201a
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