Implement more size-oriented opcodes in the depickler. (#26454)
Summary:
These are intentionally not yet used by the encoder to avoid backcompat issues.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/26454
Differential Revision: D17480844
fbshipit-source-id: e88ae7f5b94e32c7f12341a750aa4b9f7374bfb7
