Add 64bit atomic fetch add (#32354)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/32354
adding int_64 version of AtomicFetchAdd
Reviewed By: bwasti
Differential Revision: D19434349
fbshipit-source-id: b2358e8c5c6b7cd7e7b21de974b4ee1b5258fcf4
Author
Alexander Melnikov
