Address clang-tidy warnings in ProcessGroupNCCL (#50131)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/50131
Noticed that in the internal diff for
https://github.com/pytorch/pytorch/pull/49069 there was a clang-tidy warning to
use emplace instead of push_back. This can save us a copy as it eliminates the
unnecessary in-place construction
ghstack-source-id: 119560979
Test Plan: CI
Reviewed By: pritamdamania87
Differential Revision: D25800134
fbshipit-source-id: 243e57318f5d6e43de524d4e5409893febe6164c
