[PG Wrapper] Small fix (#72657)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/72657
_ProcessGroupWrapper check needs to be gated on Gloo availability,
this fails when gloo is not avail_ProcessGroupWrapper check needs to be gated
on Gloo availability, this fails when gloo is not avail.
ghstack-source-id: 148837056
Test Plan: CI
Reviewed By: zhaojuanmao
Differential Revision: D34144848
fbshipit-source-id: 42a04918b968247f3259cd2cde5438e1265b04fe
(cherry picked from commit ba5de989396cb621dffc6ef424938df494eb1be6)
