[Static runtime] Add optimize_graph_output_memory flag (#55811)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/55811
- Added manage_graph_output_memory flag to opts (default false)
- Added checking for flag dependency between enable_out_variant and optimize_graph_output_memory and optimize_memory
- Minor refactoring for readability
Test Plan: buck test mode/dev //caffe2/caffe2/fb/predictor:pytorch_predictor_test -- --exact 'caffe2/caffe2/fb/predictor:pytorch_predictor_test - PyTorchPredictor.StaticRuntime
Reviewed By: hlu1
Differential Revision: D27573780
fbshipit-source-id: 28698657f686f27b8ad60e1276cdf17402d2cf91
