[jit] Refcounting spot fixes in alias_analysis (#66295)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66295
Tidying up the top sources of reference count decrements seen during static runtime startup in alias_analysis.cpp specifically.
ghstack-source-id: 140484160
Test Plan:
CI
perf now shows under 2% time spend in ~__shared_count instead of about 5%.
Reviewed By: suo
Differential Revision: D31490761
fbshipit-source-id: bbdcb7f9065c3aafa7fff7bfea9cea6dbc41f9d9
