[jit][edge] Remove usage of shared_ptr<mobile::Code>. (#68037)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/68037
Right now mobile::Code doesn't outlive its enclosing Function, and all accesses to Code happens inside interpreter loop which doesn't outlive the module, so we don't need to use std::shared_ptr here. This also should saves us 1-2 KB for binary size, because shared_ptr seems to bloat on arm64 android.
ghstack-source-id: 145818696
Test Plan: eyes.
Reviewed By: qihqi, tugsbayasgalan
Differential Revision: D32264616
fbshipit-source-id: d83f538d6604cf75fd7728a25127b4849ce7ab2a
