Make inserted child module names unique (#27237)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/27237
Making inserted observer module and wrapper module names unique
Test Plan:
test_jit.py
Imported from OSS
Differential Revision: D18182917
fbshipit-source-id: 77aa5997fbf024c73085866550372b5e68ad9ae1
