Prevent VS2017 from emitting ambiguous symbol errors (#15697)
Summary:
These `std::forward` calls cause VS2017 to emit:
error C2872: 'std': ambiguous symbol
This fix prevents the ambiguity by specifying that `::std` is intended.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15697
Differential Revision: D13573483
Pulled By: goldsborough
fbshipit-source-id: 0439de3523a37a18df7af0cff4a1284a53833ddd
