Remove thread_local RecordFunctionGuard from profiler. (#44646)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/44646
Per a discussion with ilia-cher, this is not needed anymore and
removing it would make some future changes to support async RPC profiling
easier. Tested by ensuring profiling tests in `test_autograd.py` still pass.
ghstack-source-id: 112605618
Test Plan: CI
Reviewed By: mrshenli
Differential Revision: D23683998
fbshipit-source-id: 4e49a439509884fe04d922553890ae353e3331ab
