[PyTorch][Static Runtime] Delete cleanup_activations option (#71501)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/71501
This option disabled the memory planner. Supporting it would require us to add multiple versions of ops that borrow their inputs (because they rely on the memory planner to support that), and I'm not aware of a particular need to continue supporting it.
ghstack-source-id: 147385569
Test Plan: CI, rerun broken test from task
Reviewed By: mikeiovine
Differential Revision: D33669290
fbshipit-source-id: ecb01995891aecb5f4d0da2d9c51eed1f8fe489a
(cherry picked from commit 5e4fefb109b6c92d59fc7e24d69f1b6b2780c776)
