[Static runtime] Micro-optimization pass on GetLivenessMap (#65175)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/65175
More efficient use of map API, more efficient way to insert all pairs of inputs/outputs in liveness map
ghstack-source-id: 138547815
Test Plan: Time to enable static runtime down from ~8.7s to ~8.4s
Reviewed By: mikeiovine
Differential Revision: D30983897
fbshipit-source-id: fa6000bfd0fa0adfcd7c5922199ee32ada8c430e
