[Profiler] bug fix: python object reference counting (#85847)
Summary:
Wrong reference counting of Python Objects has made intermittent and corner-case-only segfault.
- before : increment once decrement in a loop.
- after: increment and decrement in different but consistent loops.
Test Plan: buck run mode/opt //caffe2/test:profiler
Differential Revision: D39902973
Pull Request resolved: https://github.com/pytorch/pytorch/pull/85847
Approved by: https://github.com/robieta, https://github.com/aaronenyeshi
