fix compilation error with gcc 5.5 (#38112)
Summary:
Fixed https://github.com/pytorch/pytorch/issues/38111
Pull Request resolved: https://github.com/pytorch/pytorch/pull/38112
Differential Revision: D21476876
Pulled By: malfet
fbshipit-source-id: 06d25e763eb73961f7b4e4cfbd2bb59f5ab96387
