uint32->uint64 for RedHat gflags 2.1 failing at runtime (#14724)
* uint32->uint64 for RedHat gflags 2.1 failing at runtime
* tools/legacy/benchmark_app: uint32->uint64 for RedHat gflags 2.1 failing at runtime
Co-authored-by: Ilya Lavrenov <ilya.lavrenov@intel.com>