[static runtime] Remove register concept by giving ownership to the nodes (#50050)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/50050
Every node will now own its outputs.
I don't expect any big improvements perf-wise from this diff, the only eliminated code is from deallocate_registers
Largely, this is to enable more optimizations going forward.
Test Plan:
buck test mode/dev //caffe2/benchmarks/static_runtime:static_runtime_cpptest
buck test //caffe2/test:static_runtime
Reviewed By: hlu1
Differential Revision: D25571181
fbshipit-source-id: 91fcfbd5cd968af963ba89c45656997650ca6d18
