Avoid assuming function pointer is aligned in AtomicQueueOrPtr
Avoid assuming function pointer is aligned in AtomicQueueOrPtr

Summary: this is breaking a windows build

Reviewed By: andriigrynenko

Differential Revision: D20564433

fbshipit-source-id: 7ee8b7dcb53017718cb236bf864e0b41fb118968

facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift