Zhongyi Xie 248b6b551e rename variable to avoid shadowing (#5204)
Summary:
this PR fixes the following compile warning:
```
db/memtable.cc: In member function ‘virtual void rocksdb::MemTableIterator::Seek(const rocksdb::Slice&)’:
db/memtable.cc:321:22: error: declaration of ‘user_key’ shadows a member of 'this' [-Werror=shadow]
       Slice user_key(ExtractUserKey(k));
                      ^
db/memtable.cc: In member function ‘virtual void rocksdb::MemTableIterator::SeekForPrev(const rocksdb::Slice&)’:
db/memtable.cc:338:22: error: declaration of ‘user_key’ shadows a member of 'this' [-Werror=shadow]
       Slice user_key(ExtractUserKey(k));
                      ^
```
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5204

Differential Revision: D14970160

Pulled By: miasantreble

fbshipit-source-id: 388eb089f90c4528cc6d615dd4607fb53ceac705
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