Summary:
Add MultiGet to VerifyDb and check consistency with Get in TestMultiGet.
Test plan -
make crash_test
ASAN crash test
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6849
Reviewed By: pdillinger
Differential Revision: D21635011
Pulled By: anand1976
fbshipit-source-id: deb5a79d08fefd8d8010204f1f20b83adc92310e