[jit] Refcounting spot fixes (#65346)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/65346
Tidying up the top sources of reference count decrements seen during static runtime startup.
ghstack-source-id: 140027349
Test Plan:
CI
perf now shows under 2% time spend in ~__shared_count instead of about 5%.
Reviewed By: suo
Differential Revision: D31057277
fbshipit-source-id: 9a16daf2e655fda80d4ec21290b30f02ba63d8da
