Back out "[easy][PTE] Remove GetMutableSizePrefixed* functions" (#76187)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/76187
The file `torch/csrc/jit/serialization/mobile_bytecode_generated.h` should be a generated file not edited by hand anymore. for internal usage please use `caffe2:mobile_byecode`. For OSS, until it is generated on thee fly, this checked in file will be used.
ghstack-source-id: 154485024
(Note: this ignores all push blocking failures!)
Test Plan: CI
Reviewed By: qihqi
Differential Revision: D35822915
fbshipit-source-id: d64e2a270f58c82cccafdd9139e080af923b314d
(cherry picked from commit 80ee9f4bdd6cf371abcb1551889c5c2068942942)
