Fix BenchmarkCacheSetDeleteSingleLock 'cheating' by unintentionally only locking once in the whole benchmark, rather than once per set and delete
Fix BenchmarkCacheSetDeleteSingleLock 'cheating' by unintentionally only locking once in the whole benchmark, rather than once per set and delete

zj8487/go-cache,jiangjin/go-cache,yxd-hde/go-cache,nothingmuch/go-cache,pmylund/go-cache,patrickmn/go-cache,robfig/go-cache,cognusion/go-cache-lru,ggaaooppeenngg/cachemap