jsteemann 19e8c9b64f use c++17's try_emplace if available (#5696)
Summary:
This avoids rehashing the key in TrackKey() in case the key is not already
in the map of tracked keys, which will happen at least once per key used in a
transaction.

Additionally fix two typos.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5696

Differential Revision: D17210178

Pulled By: lth

fbshipit-source-id: 7e2c28e9e505c1d1c1535d435250cf2b191a6fdf
2019-09-05 13:59:40 -07:00
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