Revert "[Profiler] Use parent time for implicitly finished Torch ops (#80810)"
This reverts commit eaf92d7883534f73b90b389a0a97fd633457fbf2.
Reverted https://github.com/pytorch/pytorch/pull/80810 on behalf of https://github.com/malfet due to Broke iOS builds, see https://github.com/pytorch/pytorch/runs/7372398950?check_suite_focus=true
