[PyTorch] Use toObjectRef in JIT interpreter (#69324)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/69324
This slightly shrinks runImpl.
Before:
- Move pointer out of IValue
- Clear the IValue to none
- Do our thing with the Object
- destroy the intrusive_ptr on the C stack
- destroy the IValue on the C stack (even though it was cleared to None, the destructor has to run anyway)
After:
- Grab the pointer out of IValue
- Do our thing with the Object
- Decref the pointer in the IValue on the JIT stack as we assign over it
We should be saving at least the memory traffic from clearing the IValue and possibly the dtor code as well.
ghstack-source-id: 144638920
Test Plan:
Inspected assembly to verify shorter runImpl
Tried to microbenchmark (D32809454) but can't show a difference.
Reviewed By: gchanan
Differential Revision: D32812252
fbshipit-source-id: a3689f061ee51ef01e4696bd4c6ffcbc41c30af5
