Zhongyi Xie 3e994809a1 fix implicit conversion error reported by clang check (#5277)
Summary:
fix the following clang check errors
```
tools/db_stress.cc:3609:30: error: implicit conversion loses integer precision: 'std::vector::size_type' (aka 'unsigned long') to 'int' [-Werror,-Wshorten-64-to-32]
    int num_keys = rand_keys.size();
        ~~~~~~~~   ~~~~~~~~~~^~~~~~
tools/db_stress.cc:3888:30: error: implicit conversion loses integer precision: 'std::vector::size_type' (aka 'unsigned long') to 'int' [-Werror,-Wshorten-64-to-32]
    int num_keys = rand_keys.size();
        ~~~~~~~~   ~~~~~~~~~~^~~~~~
2 errors generated.
make: *** [tools/db_stress.o] Error 1
```
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5277

Differential Revision: D15196620

Pulled By: miasantreble

fbshipit-source-id: d56b1420d4a9f1df875fc52877a5fbb342bc7cae
2019-05-03 10:02:27 -07:00
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