[PyTorch][Static Runtime] Fix extra refcount bumps in layer_norm (#71237)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/71237
Noticed these on inspection.
ghstack-source-id: 147171799
Test Plan: CI
Reviewed By: mikeiovine
Differential Revision: D33519799
fbshipit-source-id: 167c63323b345a5822303cecdbbbbb959f66f6e4
(cherry picked from commit 57e8da2d354497d3370906d1ae145288a2fd166b)
