[PyTorch][Static Runtime] Avoid recomputing input size in dict_unpack (#71252)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/71252
Same old problem, same old solution.
Interestingly, I tried using c10::irange instead, but that caused really bad assembly to be generated -- we lost inlining for lots of the loop body!
ghstack-source-id: 146939573
Test Plan:
CI
Spot-checked assembly before/after and confirmed that loop termination value was recomputed before and not after
Reviewed By: mikeiovine
Differential Revision: D33558118
fbshipit-source-id: 9fda2f1f89bacba2e8b5e61ba432871e973201fe
